Gestational diabetes is the correct answer as it can result in foetal macrosomia, which is caused by insulin resistance promoting fat storage, and polyhydramnios, which is caused by foetal polyuria.

While maternal obesity may cause macrosomia, it does not necessarily lead to polyhydramnios.

Foetal gut atresia is a condition where part of the intestine is narrowed or absent, which can make it difficult for the foetus to ingest substances like amniotic fluid. This can result in excess amniotic fluid and polyhydramnios, but not macrosomia.

Hydrops fetalis may cause polyhydramnios, but it does not necessarily lead to macrosomia. However, it can cause hepatosplenomegaly.

Maternal hypercalcaemia may cause polyhydramnios, but it does not necessarily lead to macrosomia.

Gestational diabetes is a common medical disorder that affects around 4% of pregnancies. It can develop during pregnancy or be a pre-existing condition. According to NICE, 87.5% of cases are gestational diabetes, 7.5% are type 1 diabetes, and 5% are type 2 diabetes. Risk factors for gestational diabetes include a BMI of > 30 kg/m², previous gestational diabetes, a family history of diabetes, and family origin with a high prevalence of diabetes. Screening for gestational diabetes involves an oral glucose tolerance test (OGTT), which should be performed as soon as possible after booking and at 24-28 weeks if the first test is normal.

To diagnose gestational diabetes, NICE recommends using the following thresholds: fasting glucose is >= 5.6 mmol/L or 2-hour glucose is >= 7.8 mmol/L. Newly diagnosed women should be seen in a joint diabetes and antenatal clinic within a week and taught about self-monitoring of blood glucose. Advice about diet and exercise should be given, and if glucose targets are not met within 1-2 weeks of altering diet/exercise, metformin should be started. If glucose targets are still not met, insulin should be added to the treatment plan.

For women with pre-existing diabetes, weight loss is recommended for those with a BMI of > 27 kg/m^2. Oral hypoglycaemic agents, apart from metformin, should be stopped, and insulin should be commenced. Folic acid 5 mg/day should be taken from pre-conception to 12 weeks gestation, and a detailed anomaly scan at 20 weeks, including four-chamber view of the heart and outflow tracts, should be performed. Tight glycaemic control reduces complication rates, and retinopathy should be treated as it can worsen during pregnancy.

Targets for self-monitoring of pregnant women with diabetes include a fasting glucose level of 5.3 mmol/l and a 1-hour or 2-hour glucose level after meals of 7.8 mmol/l or 6.4 mmol/l, respectively. It is important to manage gestational diabetes and pre-existing diabetes during pregnancy to reduce the risk of complications for both the mother and baby.

Hyperemesis gravidarum is a severe form of nausea and vomiting that affects around 1% of pregnancies. It is usually experienced between 8 and 12 weeks of pregnancy but can persist up to 20 weeks. The condition is thought to be related to raised beta hCG levels and is more common in women who are obese, nulliparous, or have multiple pregnancies, trophoblastic disease, or hyperthyroidism. Smoking is associated with a decreased incidence of hyperemesis.

The Royal College of Obstetricians and Gynaecologists recommend that a woman must have a 5% pre-pregnancy weight loss, dehydration, and electrolyte imbalance before a diagnosis of hyperemesis gravidarum can be made. Validated scoring systems such as the Pregnancy-Unique Quantification of Emesis (PUQE) score can be used to classify the severity of NVP.

Management of hyperemesis gravidarum involves using antihistamines as a first-line treatment, with oral cyclizine or oral promethazine being recommended by Clinical Knowledge Summaries. Oral prochlorperazine is an alternative, while ondansetron and metoclopramide may be used as second-line treatments. Ginger and P6 (wrist) acupressure can be tried, but there is little evidence of benefit. Admission may be needed for IV hydration.

Complications of hyperemesis gravidarum can include Wernicke’s encephalopathy, Mallory-Weiss tear, central pontine myelinolysis, acute tubular necrosis, and fetal growth restriction, pre-term birth, and cleft lip/palate (if ondansetron is used during the first trimester). The NICE Clinical Knowledge Summaries recommend considering admission if a woman is unable to keep down liquids or oral antiemetics, has ketonuria and/or weight loss (greater than 5% of body weight), or has a confirmed or suspected comorbidity that may be adversely affected by nausea and vomiting.

Smoking while pregnant has been linked to the birth of a Small for Gestational Age baby. This is indicated by the baby’s birth weight being below the 10th percentile and fetal measurements suggesting asymmetrical intrauterine growth restriction (IUGR), with the head circumference being significantly higher than the abdominal circumference and femur length. Maternal smoking is a possible cause of the baby’s small size, as it has been associated with reduced birth weight and asymmetrical IUGR. Multiple gestation is a known risk factor for fetal growth restriction, but singleton gestation is not. Maternal rubella infection and advanced maternal age may also cause small for gestational age babies, but these are less likely causes in this case as the mother’s immunisations are up to date and she is only 23 years old.

Small for Gestational Age (SGA) is a statistical definition used to describe babies who are smaller than expected for their gestational age. Although there is no universally agreed percentile, the 10th percentile is often used, meaning that 10% of normal babies will be below this threshold. SGA can be determined either antenatally or postnatally. There are two types of SGA: symmetrical and asymmetrical. Symmetrical SGA occurs when the fetal head circumference and abdominal circumference are equally small, while asymmetrical SGA occurs when the abdominal circumference slows relative to the increase in head circumference.

There are various causes of SGA, including incorrect dating, constitutionally small (normal) babies, and abnormal fetuses. Symmetrical SGA is more common and can be caused by idiopathic factors, race, sex, placental insufficiency, pre-eclampsia, chromosomal and congenital abnormalities, toxins such as smoking and heroin, and infections such as CMV, parvovirus, rubella, syphilis, and toxoplasmosis. Asymmetrical SGA is less common and can be caused by toxins such as alcohol, cigarettes, and heroin, chromosomal and congenital abnormalities, and infections.

The management of SGA depends on the type and cause. For symmetrical SGA, most cases represent the lower limits of the normal range and require fortnightly ultrasound growth assessments to demonstrate normal growth rates. Pathological causes should be ruled out by checking maternal blood for infections and searching the fetus carefully with ultrasound for markers of chromosomal abnormality. Asymmetrical SGA also requires fortnightly ultrasound growth assessments, as well as biophysical profiles and Doppler waveforms from umbilical circulation to look for absent end-diastolic flow. If results are sub-optimal, delivery may be considered.

During pregnancy, plasma urea and creatinine levels decrease due to increased renal perfusion, which allows for more efficient clearing of these substances from the circulation. Additionally, the increased plasma volume dilutes these substances. This is a result of physiological changes in pregnancy, such as increased uterine size, cervical ectropion, and increased vaginal discharge. Cardiovascular and haemodynamic changes also occur, including increased plasma volume and decreased levels of albumin, urea, and creatinine. Progesterone-related effects, such as muscle relaxation, can lead to decreased blood pressure, constipation, and bladder relaxation. It is important to note that the foetus does not have functioning kidneys, and the mother filters the blood for it.

During pregnancy, a woman’s body undergoes various physiological changes. The cardiovascular system experiences an increase in stroke volume, heart rate, and cardiac output, while systolic blood pressure remains unchanged and diastolic blood pressure decreases in the first and second trimesters before returning to normal levels by term. The enlarged uterus may cause issues with venous return, leading to ankle swelling, supine hypotension, and varicose veins.

The respiratory system sees an increase in pulmonary ventilation and tidal volume, with oxygen requirements only increasing by 20%. This can lead to a sense of dyspnea due to over-breathing and a fall in pCO2. The basal metabolic rate also increases, potentially due to increased thyroxine and adrenocortical hormones.

Maternal blood volume increases by 30%, with red blood cells increasing by 20% and plasma increasing by 50%, leading to a decrease in hemoglobin levels. Coagulant activity increases slightly, while fibrinolytic activity decreases. Platelet count falls, and white blood cell count and erythrocyte sedimentation rate rise.

The urinary system experiences an increase in blood flow and glomerular filtration rate, with elevated sex steroid levels leading to increased salt and water reabsorption and urinary protein losses. Trace glycosuria may also occur.

Calcium requirements increase during pregnancy, with gut absorption increasing substantially due to increased 1,25 dihydroxy vitamin D. Serum levels of calcium and phosphate may fall, but ionized calcium levels remain stable. The liver experiences an increase in alkaline phosphatase and a decrease in albumin levels.

The uterus undergoes significant changes, increasing in weight from 100g to 1100g and transitioning from hyperplasia to hypertrophy. Cervical ectropion and discharge may increase, and Braxton-Hicks contractions may occur in late pregnancy. Retroversion may lead to retention in the first trimester but usually self-corrects.

Rh disease is commonly linked with hydrops fetalis, a form of Haemolytic Disease of the Newborn. While Kernicterus is a possible outcome of Rh disease, it is not accurate to associate it with hepato-splenomegaly. Haemolysis leads to bilirubinemia, which is highly toxic to the nervous system, but it does not cause an enlargement of the liver and spleen. Although foetal heart failure can cause hepatomegaly, it is not related to Rh disease. Foetal liver failure, which may cause hepatomegaly, does not necessarily result in splenomegaly and is not associated with Rh disease.

Rhesus negative mothers can develop anti-D IgG antibodies if they deliver a Rh +ve child, which can cause haemolysis in future pregnancies. Prevention involves testing for D antibodies and giving anti-D prophylaxis at 28 and 34 weeks. Anti-D should also be given in various situations, such as delivery of a Rh +ve infant or amniocentesis. Tests include cord blood FBC, blood group, direct Coombs test, and Kleihauer test. Affected fetuses may experience oedema, jaundice, anaemia, hepatosplenomegaly, heart failure, and kernicterus, and may require transfusions and UV phototherapy.

The likely cause of this patient’s amenorrhoea and galactorrhoea is a prolactinoma, which inhibits the secretion of GnRH and leads to low levels of oestrogen. Further tests, including a urinary pregnancy test and blood tests for various hormones, should be conducted to confirm the diagnosis. Asherman’s syndrome, intraductal papilloma, and pregnancy are less likely causes, as they do not present with the same symptoms or do not fit the patient’s reported history.

Understanding Amenorrhoea: Causes, Investigations, and Management

Amenorrhoea is a condition characterized by the absence of menstrual periods. It can be classified into two types: primary and secondary. Primary amenorrhoea occurs when menstruation fails to start by the age of 15 in girls with normal secondary sexual characteristics or by the age of 13 in girls with no secondary sexual characteristics. On the other hand, secondary amenorrhoea is the cessation of menstruation for 3-6 months in women with previously normal and regular menses or 6-12 months in women with previous oligomenorrhoea.

The causes of amenorrhoea vary depending on the type. Primary amenorrhoea may be caused by gonadal dysgenesis, testicular feminization, congenital malformations of the genital tract, functional hypothalamic amenorrhoea, congenital adrenal hyperplasia, imperforate hymen, hypothalamic amenorrhoea, polycystic ovarian syndrome, hyperprolactinemia, premature ovarian failure, and thyrotoxicosis. Meanwhile, secondary amenorrhoea may be caused by stress, excessive exercise, PCOS, Sheehan’s syndrome, Asherman’s syndrome, and other underlying medical conditions.

To diagnose amenorrhoea, initial investigations may include pregnancy tests, full blood count, urea & electrolytes, coeliac screen, thyroid function tests, gonadotrophins, prolactin, and androgen levels. Management of amenorrhoea involves treating the underlying cause. For primary amenorrhoea, it is important to investigate and treat any underlying cause. For secondary amenorrhoea, it is important to exclude pregnancy, lactation, and menopause and treat the underlying cause accordingly. Women with primary ovarian insufficiency due to gonadal dysgenesis may benefit from hormone replacement therapy to prevent osteoporosis and other complications.

In conclusion, amenorrhoea is a condition that requires proper diagnosis and management. Understanding the causes and appropriate investigations can help in providing the necessary treatment and care for women experiencing this condition.

Pelvic inflammatory disease can be a challenging diagnosis for emergency practitioners, as it presents with vague abdominal pain that can be mistaken for a surgical or gynecological issue. While CT scans are not ideal for young patients due to the risk of radiation exposure to the sex organs, they can reveal common findings for pelvic inflammatory disease, such as free fluid in the pouch of Douglas, pelvic fat stranding, tubo-ovarian abscesses, and fallopian tube thickening of more than 5 mm. In contrast, CT scans for appendicitis may show appendiceal dilatation, thickening of the caecal apex with a bar sign, periappendiceal fat stranding and phlegmon, and focal wall nonenhancement in cases of gangrenous appendix. The most common cause of pelvic inflammatory disease is Chlamydia trachomatis, followed by Neisseria gonorrhoeae and Mycobacterium tuberculosis. In cases of appendicitis, Escherichia coli is the most likely causative organism, with rare cases caused by other organisms.

Pelvic inflammatory disease (PID) is a condition where the female pelvic organs, including the uterus, fallopian tubes, ovaries, and surrounding peritoneum, become infected and inflamed. It is typically caused by an infection that spreads from the endocervix. The most common causative organism is Chlamydia trachomatis, followed by Neisseria gonorrhoeae, Mycoplasma genitalium, and Mycoplasma hominis. Symptoms of PID include lower abdominal pain, fever, dyspareunia, dysuria, menstrual irregularities, vaginal or cervical discharge, and cervical excitation.

To diagnose PID, a pregnancy test should be done to rule out an ectopic pregnancy, and a high vaginal swab should be taken to screen for Chlamydia and gonorrhoeae. However, these tests may often be negative, so consensus guidelines recommend having a low threshold for treatment due to the potential complications of untreated PID. Management typically involves oral ofloxacin and oral metronidazole or intramuscular ceftriaxone, oral doxycycline, and oral metronidazole. In mild cases of PID, intrauterine contraceptive devices may be left in, but the evidence is limited, and removal of the IUD may be associated with better short-term clinical outcomes according to recent guidelines.

Complications of PID include perihepatitis (Fitz-Hugh Curtis Syndrome), which occurs in around 10% of cases and is characterized by right upper quadrant pain that may be confused with cholecystitis, infertility (with a risk as high as 10-20% after a single episode), chronic pelvic pain, and ectopic pregnancy.

The only correct risk factor for perineal tears is being a primigravida. Other factors such as IUGR, spontaneous vaginal delivery, and caesarian section do not increase the risk of perineal tears. However, macrosomia and instrumental delivery are known risk factors for perineal tears.

Understanding Perineal Tears: Classification and Risk Factors

Perineal tears are a common occurrence during childbirth, and the Royal College of Obstetricians and Gynaecologists (RCOG) has provided guidelines for their classification. First-degree tears are superficial and do not require any repair, while second-degree tears involve the perineal muscle and require suturing by a midwife or clinician. Third-degree tears involve the anal sphincter complex and require repair in theatre by a trained clinician, with varying degrees of severity depending on the extent of the tear. Fourth-degree tears involve the anal sphincter complex, rectal mucosa, and require repair in theatre by a trained clinician.

There are several risk factors for perineal tears, including being a first-time mother, delivering a large baby, experiencing a precipitant labour, and having a shoulder dystocia or forceps delivery. It is important for healthcare providers to be aware of these risk factors and to provide appropriate care and support during childbirth to minimize the risk of perineal tears. By understanding the classification and risk factors associated with perineal tears, healthcare providers can better prepare for and manage this common complication of childbirth.

The main cause of menopausal symptoms is low levels of oestrogen, which is why hormone replacement therapy (HRT) aims to alleviate these symptoms by supplementing oestrogen. However, oestrogen can lead to thickening of the endometrium, which increases the risk of neoplasia. To counteract this risk, progesterone is also included in HRT to prevent endometrial thickening and any associated malignancy.

Therefore, any statement suggesting that progesterone is used for symptomatic relief, that oestrogen is protective, or that progesterone and oestrogen work together in a synergistic manner is incorrect.

Symptoms of Menopause

Menopause is a natural biological process that marks the end of a woman’s reproductive years. It is characterized by a decrease in the levels of female hormones, particularly oestrogen, which can lead to a range of symptoms. One of the most common symptoms is a change in periods, including changes in the length of menstrual cycles and dysfunctional uterine bleeding.

Around 80% of women experience vasomotor symptoms, which can occur daily and last for up to five years. These symptoms include hot flushes and night sweats. Urogenital changes are also common, affecting around 35% of women. These changes can include vaginal dryness and atrophy, as well as urinary frequency.

In addition to physical symptoms, menopause can also have psychological effects. Approximately 10% of women experience anxiety and depression during this time, as well as short-term memory impairment. It is important to note that menopause can also have longer-term complications, such as an increased risk of osteoporosis and ischaemic heart disease.

If a cervical smear sample tests positive for hrHPV, it should be examined cytologically to check for any abnormal nuclear changes in the cells. Referral to colposcopy would only be necessary if the cytological examination shows abnormal results. Patients who test negative for hrHPV should return to routine screening. If the initial sample is inadequate, it should be repeated in three months. However, if there are three inadequate smears, the patient should be referred to colposcopy. If the cytology is normal despite being positive for hrHPV, the sample should be repeated in 12 months.

Understanding Cervical Cancer Screening Results

The cervical cancer screening program has evolved significantly in recent years, with the introduction of HPV testing allowing for further risk stratification. The NHS now uses an HPV first system, where a sample is tested for high-risk strains of human papillomavirus (hrHPV) first, and cytological examination is only performed if this is positive.

If the hrHPV test is negative, individuals can return to normal recall, unless they fall under the test of cure pathway, untreated CIN1 pathway, or require follow-up for incompletely excised cervical glandular intraepithelial neoplasia (CGIN) / stratified mucin producing intraepithelial lesion (SMILE) or cervical cancer. If the hrHPV test is positive, samples are examined cytologically, and if the cytology is abnormal, individuals will require colposcopy.

If the cytology is normal but the hrHPV test is positive, the test is repeated at 12 months. If the repeat test is still hrHPV positive and cytology is normal, a further repeat test is done 12 months later. If the hrHPV test is negative at 24 months, individuals can return to normal recall, but if it is still positive, they will require colposcopy. If the sample is inadequate, it will need to be repeated within 3 months, and if two consecutive samples are inadequate, colposcopy will be required.

For individuals who have previously had CIN, they should be invited for a test of cure repeat cervical sample in the community 6 months after treatment. The most common treatment for cervical intraepithelial neoplasia is large loop excision of transformation zone (LLETZ), which may be done during the initial colposcopy visit or at a later date depending on the individual clinic. Cryotherapy is an alternative technique.

During menopause, there is a decrease in oestrogen levels due to the ovaries responding poorly to FSH and LH. This leads to an increase in both FSH and LH levels as there is less negative feedback from oestrogen. Therefore, any response indicating high levels of one hormone and low levels of the other is incorrect.

Understanding Menopause and Contraception

Menopause is a natural biological process that marks the end of a woman’s reproductive years. It typically occurs when a woman reaches the age of 51 in the UK. However, prior to menopause, women may experience a period known as the climacteric. During this time, ovarian function starts to decline, and women may experience symptoms such as hot flashes, mood swings, and vaginal dryness.

It is important for women to understand that they can still become pregnant during the climacteric period. Therefore, it is recommended to use effective contraception until a certain period of time has passed. Women over the age of 50 should use contraception for 12 months after their last period, while women under the age of 50 should use contraception for 24 months after their last period. By understanding menopause and the importance of contraception during the climacteric period, women can make informed decisions about their reproductive health.

The axillary nodes are responsible for draining the majority of lymphatic fluid from breast tissue. These nodes are located under the arms and are often affected by tumour invasion. If lymphatic spread is confirmed, a surgical procedure called axillary lymph node dissection may be performed to remove the affected nodes. The contralateral axillary nodes are not involved in the drainage of the affected breast. The infraclavicular nodes primarily drain the forearm and hand, and are not commonly affected by breast tumour metastasis. The parasternal nodes are a potential site of metastasis from all quadrants of the breast, but do not play a major role in breast tissue lymphatic drainage.

The breast is situated on a layer of pectoral fascia and is surrounded by the pectoralis major, serratus anterior, and external oblique muscles. The nerve supply to the breast comes from branches of intercostal nerves from T4-T6, while the arterial supply comes from the internal mammary (thoracic) artery, external mammary artery (laterally), anterior intercostal arteries, and thoraco-acromial artery. The breast’s venous drainage is through a superficial venous plexus to subclavian, axillary, and intercostal veins. Lymphatic drainage occurs through the axillary nodes, internal mammary chain, and other lymphatic sites such as deep cervical and supraclavicular fossa (later in disease).

The preparation for lactation involves the hormones oestrogen, progesterone, and human placental lactogen. Oestrogen promotes duct development in high concentrations, while high levels of progesterone stimulate the formation of lobules. Human placental lactogen prepares the mammary glands for lactation. The two hormones involved in stimulating lactation are prolactin and oxytocin. Prolactin causes milk secretion, while oxytocin causes contraction of the myoepithelial cells surrounding the mammary alveoli to result in milk ejection from the breast. Suckling of the baby stimulates the mechanoreceptors in the nipple, resulting in the release of both prolactin and oxytocin from the pituitary gland (anterior and posterior parts respectively).

The correct answer is the cardinal ligament, which connects the cervix to the lateral pelvic wall. Pelvic surgery can damage this ligament, which may lead to cervical prolapse in severe cases.

The broad ligament surrounds the fallopian tubes and ovaries, along with their respective neurovascular structures. However, it does not attach the cervix to the lateral pelvic wall.

The pubocervical ligament anchors the cervix to the pubic symphysis. In severe cases, damage to this ligament may contribute to vaginal prolapse.

The round ligament of the uterus maintains the anteverted position of the uterus. During pregnancy, stretching of the round ligament may cause round ligament pain.

The uterosacral ligament anchors the uterus to the sacrum posteriorly, helping to maintain normal pelvic anatomy and prevent the descent of pelvic organs into the vaginal vault.

Pelvic Ligaments and their Connections

Pelvic ligaments are structures that connect various organs within the female reproductive system to the pelvic wall. These ligaments play a crucial role in maintaining the position and stability of these organs. There are several types of pelvic ligaments, each with its own unique function and connection.

The broad ligament connects the uterus, fallopian tubes, and ovaries to the pelvic wall, specifically the ovaries. The round ligament connects the uterine fundus to the labia majora, but does not connect to any other structures. The cardinal ligament connects the cervix to the lateral pelvic wall and is responsible for supporting the uterine vessels. The suspensory ligament of the ovaries connects the ovaries to the lateral pelvic wall and supports the ovarian vessels. The ovarian ligament connects the ovaries to the uterus, but does not connect to any other structures. Finally, the uterosacral ligament connects the cervix and posterior vaginal dome to the sacrum, but does not connect to any other structures.

Overall, pelvic ligaments are essential for maintaining the proper position and function of the female reproductive organs. Understanding the connections between these ligaments and the structures they support is crucial for diagnosing and treating any issues that may arise.

Shoulder dystocia is the labour complication discussed in this case, and it is more likely to occur in cases of foetal macrosomia. This is because larger babies have a greater shoulder diameter, making it more difficult for the shoulders to pass through the pelvic outlet.

Maternal pre-eclampsia is a risk factor for small for gestational age (SGA) pregnancies, but it is not directly linked to shoulder dystocia.

Obstetric cholestasis is a liver disorder that can occur during pregnancy, but it does not increase the risk of shoulder dystocia.

While a previous caesarean section may increase the likelihood of placenta praevia, placenta accreta, or uterine rupture, it is not a direct risk factor for shoulder dystocia.

A previous post-term delivery may increase the likelihood of future post-term deliveries, but it does not directly increase the risk of shoulder dystocia.

Shoulder dystocia is a complication that can occur during vaginal delivery when the body of the fetus cannot be delivered after the head has already been delivered. This is usually due to the anterior shoulder of the fetus becoming stuck on the mother’s pubic bone. Shoulder dystocia can cause harm to both the mother and the baby.

There are several risk factors that increase the likelihood of shoulder dystocia, including fetal macrosomia (large baby), high maternal body mass index, diabetes mellitus, and prolonged labor.

If shoulder dystocia is identified, it is important to call for senior medical assistance immediately. The McRoberts’ maneuver is often used to help deliver the baby. This involves flexing and abducting the mother’s hips to increase the angle of the pelvis and facilitate delivery. An episiotomy may be performed to provide better access for internal maneuvers, but it will not relieve the bony obstruction. Symphysiotomy and the Zavanelli maneuver are not recommended as they can cause significant harm to the mother. Oxytocin administration is not effective in treating shoulder dystocia.

Complications of shoulder dystocia can include postpartum hemorrhage and perineal tears for the mother, and brachial plexus injury or neonatal death for the baby. It is important to manage shoulder dystocia promptly and effectively to minimize these risks.

The primary location for lymphatic drainage of the breast is the ipsilateral axillary nodes. While there have been cases of breast cancer spreading to contralateral axillary nodes, these nodes do not represent the main site of lymphatic drainage for the opposite breast. The parasternal nodes receive some lymphatic drainage, but they are not the primary site for breast drainage. The supraclavicular nodes may occasionally receive drainage from the breast, but this is not significant. The infraclavicular nodes, despite their proximity, do not drain the breast; they instead receive drainage from the forearm and hand.

The breast is situated on a layer of pectoral fascia and is surrounded by the pectoralis major, serratus anterior, and external oblique muscles. The nerve supply to the breast comes from branches of intercostal nerves from T4-T6, while the arterial supply comes from the internal mammary (thoracic) artery, external mammary artery (laterally), anterior intercostal arteries, and thoraco-acromial artery. The breast’s venous drainage is through a superficial venous plexus to subclavian, axillary, and intercostal veins. Lymphatic drainage occurs through the axillary nodes, internal mammary chain, and other lymphatic sites such as deep cervical and supraclavicular fossa (later in disease).

The preparation for lactation involves the hormones oestrogen, progesterone, and human placental lactogen. Oestrogen promotes duct development in high concentrations, while high levels of progesterone stimulate the formation of lobules. Human placental lactogen prepares the mammary glands for lactation. The two hormones involved in stimulating lactation are prolactin and oxytocin. Prolactin causes milk secretion, while oxytocin causes contraction of the myoepithelial cells surrounding the mammary alveoli to result in milk ejection from the breast. Suckling of the baby stimulates the mechanoreceptors in the nipple, resulting in the release of both prolactin and oxytocin from the pituitary gland (anterior and posterior parts respectively).

Twin Pregnancies: Incidence, Types, and Complications

Twin pregnancies occur in approximately 1 out of 105 pregnancies, with the majority being dizygotic or non-identical twins. Monozygotic or identical twins, on the other hand, develop from a single ovum that has divided to form two embryos. However, monoamniotic monozygotic twins are associated with increased risks of spontaneous miscarriage, perinatal mortality rate, malformations, intrauterine growth restriction, prematurity, and twin-to-twin transfusions. The incidence of dizygotic twins is increasing due to infertility treatment, and predisposing factors include previous twins, family history, increasing maternal age, multigravida, induced ovulation, in-vitro fertilisation, and race, particularly Afro-Caribbean.

Antenatal complications of twin pregnancies include polyhydramnios, pregnancy-induced hypertension, anaemia, and antepartum haemorrhage. Fetal complications include perinatal mortality, prematurity, light-for-date babies, and malformations, especially in monozygotic twins. Labour complications may also arise, such as postpartum haemorrhage, malpresentation, cord prolapse, and entanglement.

Management of twin pregnancies involves rest, ultrasound for diagnosis and monthly checks, additional iron and folate, more antenatal care, and precautions during labour, such as having two obstetricians present. Most twins deliver by 38 weeks, and if longer, most are induced at 38-40 weeks. Overall, twin pregnancies require close monitoring and management to ensure the best possible outcomes for both mother and babies.

The most common type of ovulatory disorder is normogonadotropic normoestrogenic anovulation, which is often associated with polycystic ovarian syndrome (PCOS). This condition is characterized by normal levels of gonadotropin and estrogen, but low levels of FSH during the follicular phase can lead to anovulation. It is important to perform a thorough evaluation of both male and female factors when investigating infertility. Hypogonadotropic hypogonadal anovulation, which is characterized by low levels of GnRH or pituitary unresponsiveness to GnRH, resulting in low gonadotropins and low estrogen, is seen in conditions such as amenorrhea due to low weight, stress, or Sheehan syndrome. Uterine abnormalities, such as fibroids, may also contribute to infertility, but this is not consistent with the clinical findings in this case. Hypergonadotropic hypoestrogenic anovulation, which is characterized by high levels of gonadotropins but unresponsive ovaries and low estrogen levels, is more commonly seen in conditions such as Turner’s syndrome, primary ovarian failure, or ovary damage.

Understanding Ovulation Induction and Its Categories

Ovulation induction is a common treatment for couples who have difficulty conceiving naturally due to ovulation disorders. The process of ovulation requires a balance of hormones and feedback loops between the hypothalamus, pituitary gland, and ovaries. Anovulation can occur due to alterations in this balance, which can be classified into three categories: hypogonadotropic hypogonadal anovulation, normogonadotropic normoestrogenic anovulation, and hypergonadotropic hypoestrogenic anovulation. The goal of ovulation induction is to induce mono-follicular development and subsequent ovulation, leading to a singleton pregnancy.

There are various forms of ovulation induction, starting with the least invasive and simplest management option first. Exercise and weight loss are typically the first-line treatment for patients with polycystic ovarian syndrome, as ovulation can spontaneously return with even a modest 5% weight loss. Letrozole is now considered the first-line medical therapy for patients with PCOS due to its reduced risk of adverse effects on endometrial and cervical mucous compared to clomiphene citrate. Clomiphene citrate is a selective estrogen receptor modulator that acts primarily at the hypothalamus, blocking the negative feedback effect of estrogens. Gonadotropin therapy tends to be the treatment used mostly for women with hypogonadotropic hypogonadism.

One potential side effect of ovulation induction is ovarian hyperstimulation syndrome (OHSS), which can be life-threatening if not identified and managed promptly. OHSS occurs when ovarian enlargement with multiple cystic spaces form, and an increase in the permeability of capillaries leads to a fluid shift from the intravascular to the extra-vascular space. The severity of OHSS varies, with the risk of severe OHSS occurring in less than 1% of all women undergoing ovarian induction. Management includes fluid and electrolyte replacement, anticoagulation therapy, abdominal ascitic paracentesis, and pregnancy termination to prevent further hormonal imbalances.

Miscarriage is the loss of a pregnancy before the 20th week. It is a common occurrence, with about 10-20% of pregnancies ending in miscarriage. In most cases, the cause of miscarriage is unknown, but it can be due to genetic abnormalities, hormonal imbalances, or health conditions such as diabetes or thyroid problems.

There are different types of miscarriage, including complete, incomplete, inevitable, and septic. A complete miscarriage is when all fetal tissue has been passed, bleeding has stopped, the uterus is no longer enlarged, and the cervical os is closed. An incomplete miscarriage is when only some fetal parts have been passed, and the cervical os is usually open. An inevitable miscarriage means that a miscarriage is about to occur, with the fetus still possibly alive but the cervical os open and bleeding usually heavier. A septic miscarriage occurs when the contents of the uterus are infected, causing endometritis. Symptoms include offensive vaginal loss, tender uterus, and in cases of pelvic infection, abdominal pain and peritonism.

Types of Miscarriage

Miscarriage is a common complication that can occur during pregnancy. There are different types of miscarriage, each with its own set of symptoms and characteristics. One type is threatened miscarriage, which is painless vaginal bleeding that occurs before 24 weeks, typically at 6-9 weeks. The bleeding is usually less than menstruation, and the cervical os is closed. This type of miscarriage complicates up to 25% of all pregnancies.

Another type is missed (delayed) miscarriage, which is characterized by a gestational sac that contains a dead fetus before 20 weeks without the symptoms of expulsion. The mother may experience light vaginal bleeding or discharge and the disappearance of pregnancy symptoms, but pain is not usually present. The cervical os is closed, and when the gestational sac is larger than 25 mm and no embryonic or fetal part can be seen, it is sometimes referred to as a blighted ovum or anembryonic pregnancy.

Inevitable miscarriage is another type, which is characterized by heavy bleeding with clots and pain. The cervical os is open in this case. Lastly, incomplete miscarriage occurs when not all products of conception have been expelled. This type of miscarriage is characterized by pain and vaginal bleeding, and the cervical os is open. Understanding the different types of miscarriage can help individuals recognize the symptoms and seek appropriate medical attention.

Breastfeeding has been linked to prolonged neonatal jaundice, which is characterized by high levels of bilirubin in an otherwise healthy breastfed newborn after the first week of life. This type of jaundice lasts longer than normal and has no other identifiable cause. It is important to consider the age at which jaundice appears in order to determine potential underlying causes, such as haemolytic disease, infections, G6PD deficiency, sepsis, polycythaemia, extrahepatic biliary atresia, congenital hypothyroidism, or breastfeeding.

Advantages and Disadvantages of Breastfeeding

Breastfeeding has numerous advantages for both the mother and the baby. For the mother, it promotes bonding with the baby and helps with the involution of the uterus. It also provides protection against breast and ovarian cancer and is a cheap alternative to formula feeding as there is no need to sterilize bottles. However, it should not be relied upon as a contraceptive method as it is unreliable.

Breast milk contains immunological components such as IgA, lysozyme, and lactoferrin that protect mucosal surfaces, have bacteriolytic properties, and ensure rapid absorption of iron so it is not available to bacteria. This reduces the incidence of ear, chest, and gastrointestinal infections, as well as eczema, asthma, and type 1 diabetes mellitus. Breastfeeding also reduces the incidence of sudden infant death syndrome.

One of the advantages of breastfeeding is that the baby is in control of how much milk it takes. However, there are also disadvantages such as the transmission of drugs and infections such as HIV. Prolonged breastfeeding may also lead to nutrient inadequacies such as vitamin D and vitamin K deficiencies, as well as breast milk jaundice.

In conclusion, while breastfeeding has numerous advantages, it is important to be aware of the potential disadvantages and to consult with a healthcare professional to ensure that both the mother and the baby are receiving adequate nutrition and care.

To test for ovulation in women with regular cycles, Day 21 progesterone (mid-luteal cycle progesterone) is used. However, for those with irregular cycles, progesterone should be tested a week before the predicted menstruation. Ovulation is necessary for fertilization to occur, as it indicates the release of an egg.

Oestrogen and Progesterone: Their Sources and Functions

Oestrogen and progesterone are two important hormones in the female body. Oestrogen is primarily produced by the ovaries, but can also be produced by the placenta and blood via aromatase. Its functions include promoting the development of genitalia, causing the LH surge, and increasing hepatic synthesis of transport proteins. It also upregulates oestrogen, progesterone, and LH receptors, and is responsible for female fat distribution. On the other hand, progesterone is produced by the corpus luteum, placenta, and adrenal cortex. Its main function is to maintain the endometrium and pregnancy, as well as to thicken cervical mucous and decrease myometrial excitability. It also increases body temperature and is responsible for spiral artery development.

It is important to note that these hormones work together in regulating the menstrual cycle and preparing the body for pregnancy. Oestrogen promotes the proliferation of the endometrium, while progesterone maintains it. Without these hormones, the menstrual cycle and pregnancy would not be possible. Understanding the sources and functions of oestrogen and progesterone is crucial in diagnosing and treating hormonal imbalances and reproductive disorders.

Pelvic inflammatory disease is most commonly caused by chlamydia and gonorrhoeae, with gonorrhoeae being the likely cause in this patient since they do not have chlamydia. While HIV does not directly cause pelvic inflammatory disease, it can increase the risk of contracting sexually transmitted infections. Syphilis follows its own distinct clinical course and does not cause pelvic inflammatory disease, while herpes typically presents with painful genital blisters but does not cause pelvic inflammatory disease.

Pelvic inflammatory disease (PID) is a condition where the female pelvic organs, including the uterus, fallopian tubes, ovaries, and surrounding peritoneum, become infected and inflamed. It is typically caused by an infection that spreads from the endocervix. The most common causative organism is Chlamydia trachomatis, followed by Neisseria gonorrhoeae, Mycoplasma genitalium, and Mycoplasma hominis. Symptoms of PID include lower abdominal pain, fever, dyspareunia, dysuria, menstrual irregularities, vaginal or cervical discharge, and cervical excitation.

To diagnose PID, a pregnancy test should be done to rule out an ectopic pregnancy, and a high vaginal swab should be taken to screen for Chlamydia and gonorrhoeae. However, these tests may often be negative, so consensus guidelines recommend having a low threshold for treatment due to the potential complications of untreated PID. Management typically involves oral ofloxacin and oral metronidazole or intramuscular ceftriaxone, oral doxycycline, and oral metronidazole. In mild cases of PID, intrauterine contraceptive devices may be left in, but the evidence is limited, and removal of the IUD may be associated with better short-term clinical outcomes according to recent guidelines.

Complications of PID include perihepatitis (Fitz-Hugh Curtis Syndrome), which occurs in around 10% of cases and is characterized by right upper quadrant pain that may be confused with cholecystitis, infertility (with a risk as high as 10-20% after a single episode), chronic pelvic pain, and ectopic pregnancy.

The most uncommon and recent occurrence of twins is when they are conjoined, resulting in a unique cleavage.

When twins share the same placenta, known as monochorionic twins, there is a possibility of uneven blood flow between them. This can lead to one twin receiving more blood than the other, which often requires medical intervention.

Dizygotic twins, which come from two separate eggs, have a higher chance of occurring in certain situations. These include being between the ages of 35-40, having a family history of twins, previously giving birth to multiples, having a high BMI, smoking, and conceiving in the summer or autumn.

Around 1 in 10 dichorionic twins are monozygotic, meaning they come from a single fertilized egg that splits into two embryos.

Triplets can occur when two eggs are fertilized, and one of them splits into a pair of monozygotic twins.

Twin Pregnancies: Incidence, Types, and Complications

Twin pregnancies occur in approximately 1 out of 105 pregnancies, with the majority being dizygotic or non-identical twins. Monozygotic or identical twins, on the other hand, develop from a single ovum that has divided to form two embryos. However, monoamniotic monozygotic twins are associated with increased risks of spontaneous miscarriage, perinatal mortality rate, malformations, intrauterine growth restriction, prematurity, and twin-to-twin transfusions. The incidence of dizygotic twins is increasing due to infertility treatment, and predisposing factors include previous twins, family history, increasing maternal age, multigravida, induced ovulation, in-vitro fertilisation, and race, particularly Afro-Caribbean.

Antenatal complications of twin pregnancies include polyhydramnios, pregnancy-induced hypertension, anaemia, and antepartum haemorrhage. Fetal complications include perinatal mortality, prematurity, light-for-date babies, and malformations, especially in monozygotic twins. Labour complications may also arise, such as postpartum haemorrhage, malpresentation, cord prolapse, and entanglement.

Management of twin pregnancies involves rest, ultrasound for diagnosis and monthly checks, additional iron and folate, more antenatal care, and precautions during labour, such as having two obstetricians present. Most twins deliver by 38 weeks, and if longer, most are induced at 38-40 weeks. Overall, twin pregnancies require close monitoring and management to ensure the best possible outcomes for both mother and babies.

The woman’s history of molar pregnancy suggests choriocarcinoma as a potential complication. Bleeding lasting one month after vaginal trauma, vaginitis, or uterine atony is not normal. Endometrial cancer is unlikely in women of childbearing age.

Gestational trophoblastic disorders refer to a range of conditions that originate from the placental trophoblast. These disorders include complete hydatidiform mole, partial hydatidiform mole, and choriocarcinoma. Complete hydatidiform mole is a benign tumor of trophoblastic material that occurs when an empty egg is fertilized by a single sperm that duplicates its own DNA, resulting in all 46 chromosomes being of paternal origin. Symptoms of this disorder include bleeding in the first or early second trimester, exaggerated pregnancy symptoms, a large uterus for dates, and high levels of human chorionic gonadotropin (hCG) in the blood. Hypertension and hyperthyroidism may also be present. Urgent referral to a specialist center is necessary, and evacuation of the uterus is performed. Effective contraception is recommended to avoid pregnancy in the next 12 months. About 2-3% of cases may progress to choriocarcinoma. In partial mole, a normal haploid egg may be fertilized by two sperms or one sperm with duplication of paternal chromosomes, resulting in DNA that is both maternal and paternal in origin. Fetal parts may be visible, and the condition is usually triploid.

The internal mammary artery is the primary source of arterial supply to the breast, with the external mammary and lateral thoracic arteries playing a smaller role. This information is relevant for surgeons performing reduction mammoplasty surgeries.

The breast is situated on a layer of pectoral fascia and is surrounded by the pectoralis major, serratus anterior, and external oblique muscles. The nerve supply to the breast comes from branches of intercostal nerves from T4-T6, while the arterial supply comes from the internal mammary (thoracic) artery, external mammary artery (laterally), anterior intercostal arteries, and thoraco-acromial artery. The breast’s venous drainage is through a superficial venous plexus to subclavian, axillary, and intercostal veins. Lymphatic drainage occurs through the axillary nodes, internal mammary chain, and other lymphatic sites such as deep cervical and supraclavicular fossa (later in disease).

The preparation for lactation involves the hormones oestrogen, progesterone, and human placental lactogen. Oestrogen promotes duct development in high concentrations, while high levels of progesterone stimulate the formation of lobules. Human placental lactogen prepares the mammary glands for lactation. The two hormones involved in stimulating lactation are prolactin and oxytocin. Prolactin causes milk secretion, while oxytocin causes contraction of the myoepithelial cells surrounding the mammary alveoli to result in milk ejection from the breast. Suckling of the baby stimulates the mechanoreceptors in the nipple, resulting in the release of both prolactin and oxytocin from the pituitary gland (anterior and posterior parts respectively).

Cystic Fibrosis Inheritance

Cystic fibrosis is a genetic disorder that is inherited in an autosomal recessive pattern. This means that both copies of the gene in each cell have mutations. Individuals with only one copy of the mutated gene are carriers and typically do not show signs or symptoms of the condition.

In the case of a female carrier for the CF gene, there is a 1 in 2 chance of producing a gamete carrying the CF gene. If her new partner is also a carrier, he has a 1 in 25 chance of having the CF gene and a 1 in 50 chance of producing a gamete with the CF gene. Therefore, the chance of producing a child with cystic fibrosis is 1 in 100.

It is important to understand the inheritance pattern of cystic fibrosis to make informed decisions about family planning and genetic testing. This knowledge can help individuals and families better understand the risks and potential outcomes of having children with this condition.

The lining of the ectocervix consists of non-keratinized stratified squamous epithelium.

Anatomy of the Uterus

The uterus is a female reproductive organ that is located within the pelvis and is covered by the peritoneum. It is supplied with blood by the uterine artery, which runs alongside the uterus and anastomoses with the ovarian artery. The uterus is supported by various ligaments, including the central perineal tendon, lateral cervical, round, and uterosacral ligaments. The ureter is located close to the uterus, and injuries to the ureter can occur when there is pathology in the area.

The uterus is typically anteverted and anteflexed in most women. Its topography can be visualized through imaging techniques such as ultrasound or MRI. Understanding the anatomy of the uterus is important for diagnosing and treating various gynecological conditions.

If a woman experiences postmenopausal bleeding, it is important for medical professionals to consider the possibility of endometrial cancer. According to NICE guidelines from 2015, women aged 55 or older with postmenopausal bleeding should be urgently referred for further evaluation.

One common method of evaluation is a transvaginal ultrasound, which can measure the thickness of the endometrial lining. A 3-mm cut-off is often used and has been found to be highly effective in detecting endometrial cancer. This method can also identify women who are unlikely to have endometrial cancer, which can help avoid more invasive procedures such as endometrial biopsy. However, some medical centers may use a cut-off of 4 mm or even 5 mm for endometrial biopsy.

In the case of a woman with an endometrial thickness of 6mm, the next step would be to perform an endometrial biopsy.

Endometrial cancer is a type of cancer that is commonly found in women who have gone through menopause, but it can also occur in around 25% of cases before menopause. The prognosis for this type of cancer is usually good due to early detection. There are several risk factors associated with endometrial cancer, including obesity, nulliparity, early menarche, late menopause, unopposed estrogen, diabetes mellitus, tamoxifen, polycystic ovarian syndrome, and hereditary non-polyposis colorectal carcinoma. Symptoms of endometrial cancer include postmenopausal bleeding, which is usually slight and intermittent at first before becoming heavier, and changes in intermenstrual bleeding for premenopausal women. Pain is not common and typically signifies extensive disease, while vaginal discharge is unusual.

When investigating endometrial cancer, women who are 55 years or older and present with postmenopausal bleeding should be referred using the suspected cancer pathway. The first-line investigation is trans-vaginal ultrasound, which has a high negative predictive value for a normal endometrial thickness of less than 4 mm. Hysteroscopy with endometrial biopsy is also commonly used for diagnosis. Treatment for localized disease typically involves total abdominal hysterectomy with bilateral salpingo-oophorectomy, while patients with high-risk disease may require postoperative radiotherapy. Progestogen therapy may be used in frail elderly women who are not considered suitable for surgery. It is important to note that the combined oral contraceptive pill and smoking are protective against endometrial cancer.

Dairy products are a source of calcium, which is necessary for the mineralisation of teeth and bones. Zinc, an essential trace element found in animal-based foods, is involved in various biological processes such as gene expression and signal transduction. Magnesium is crucial for enzymes that synthesise or use ATP and interacts significantly with phosphate. Vitamin C acts as a reducing agent, and a lack of it can lead to scurvy.

Folic Acid: Importance, Deficiency, and Prevention

Folic acid is a vital nutrient that is converted to tetrahydrofolate (THF) in the body. THF plays a crucial role in transferring 1-carbon units to essential substrates involved in DNA and RNA synthesis. Green, leafy vegetables are a good source of folic acid. However, certain medications like phenytoin and methotrexate, pregnancy, and alcohol excess can cause folic acid deficiency. This deficiency can lead to macrocytic, megaloblastic anemia and neural tube defects.

To prevent neural tube defects during pregnancy, all women should take 400mcg of folic acid until the 12th week of pregnancy. Women at higher risk of conceiving a child with a neural tube defect should take 5 mg of folic acid from before conception until the 12th week of pregnancy. Women are considered higher risk if either partner has a neural tube defect, they have had a previous pregnancy affected by a neural tube defect, or they have a family history of a neural tube defect. Additionally, women with antiepileptic drugs or coeliac disease, diabetes, or thalassaemia trait, and those who are obese (BMI of 30 kg/m2 or more) are also at higher risk and should take the higher dose of folic acid.

The inguinal nodes are responsible for draining the scrotum.

Anatomy of the Scrotum and Testes

The scrotum is composed of skin and dartos fascia, with an arterial supply from the anterior and posterior scrotal arteries. It is also the site of lymphatic drainage to the inguinal lymph nodes. The testes are surrounded by the tunica vaginalis, a closed peritoneal sac, with the parietal layer adjacent to the internal spermatic fascia. The testicular arteries arise from the aorta, just below the renal arteries, and the pampiniform plexus drains into the testicular veins. The left testicular vein drains into the left renal vein, while the right testicular vein drains into the inferior vena cava. Lymphatic drainage occurs to the para-aortic nodes.

The spermatic cord is formed by the vas deferens and is covered by the internal spermatic fascia, cremasteric fascia, and external spermatic fascia. The cord contains the vas deferens, testicular artery, artery of vas deferens, cremasteric artery, pampiniform plexus, sympathetic nerve fibers, genital branch of the genitofemoral nerve, and lymphatic vessels. The vas deferens transmits sperm and accessory gland secretions, while the testicular artery supplies the testis and epididymis. The cremasteric artery arises from the inferior epigastric artery, and the pampiniform plexus is a venous plexus that drains into the right or left testicular vein. The sympathetic nerve fibers lie on the arteries, while the parasympathetic fibers lie on the vas. The genital branch of the genitofemoral nerve supplies the cremaster. Lymphatic vessels drain to lumbar and para-aortic nodes.

Placental insufficiency is linked to asymmetrical growth restriction in small for gestational age babies.

When a fetus or infant experiences growth restriction, it can be categorized as either symmetrical or asymmetrical.

Asymmetrical growth restriction occurs when the weight or abdominal circumference is lower than the head circumference. This is typically caused by inadequate nutrition from the placenta in the later stages of pregnancy, with brain growth being prioritized over liver glycogen and skin fat. Placental insufficiency is often associated with this type of growth restriction.

Symmetrical growth restriction, on the other hand, is characterized by a reduction in head circumference that is equal to other measurements. This type of growth restriction is usually caused by factors such as congenital infection, fetal chromosomal disorder (such as Down syndrome), underlying maternal hypothyroidism, or malnutrition. It suggests a prolonged period of poor intrauterine growth that begins early in pregnancy.

In reality, it is often difficult to distinguish between asymmetrical and symmetrical growth restriction.

Small for Gestational Age (SGA) is a statistical definition used to describe babies who are smaller than expected for their gestational age. Although there is no universally agreed percentile, the 10th percentile is often used, meaning that 10% of normal babies will be below this threshold. SGA can be determined either antenatally or postnatally. There are two types of SGA: symmetrical and asymmetrical. Symmetrical SGA occurs when the fetal head circumference and abdominal circumference are equally small, while asymmetrical SGA occurs when the abdominal circumference slows relative to the increase in head circumference.

There are various causes of SGA, including incorrect dating, constitutionally small (normal) babies, and abnormal fetuses. Symmetrical SGA is more common and can be caused by idiopathic factors, race, sex, placental insufficiency, pre-eclampsia, chromosomal and congenital abnormalities, toxins such as smoking and heroin, and infections such as CMV, parvovirus, rubella, syphilis, and toxoplasmosis. Asymmetrical SGA is less common and can be caused by toxins such as alcohol, cigarettes, and heroin, chromosomal and congenital abnormalities, and infections.

The management of SGA depends on the type and cause. For symmetrical SGA, most cases represent the lower limits of the normal range and require fortnightly ultrasound growth assessments to demonstrate normal growth rates. Pathological causes should be ruled out by checking maternal blood for infections and searching the fetus carefully with ultrasound for markers of chromosomal abnormality. Asymmetrical SGA also requires fortnightly ultrasound growth assessments, as well as biophysical profiles and Doppler waveforms from umbilical circulation to look for absent end-diastolic flow. If results are sub-optimal, delivery may be considered.