Precocious Puberty is the development of secondary sexual characteristics before the age of 8 in females, and 9 in males. The first sign of early puberty in males is testicular enlargement, followed by growth of the penis and the scrotum at least a year after. Precocious puberty in boys in uncommon and usually has an organic cause leading to excess secretion of testosterone. These can be gonadotrophin dependent in the case of an inter cranial lesion, where the testes would be bilaterally enlarged, or from excess production from the adrenal gland in the case of adrenal hyperplasia or a tumour.

Ataxic gait is not a direct association of Down’s syndrome. All other given responses are associated with Down’s syndrome.

Being anatomically situated immediately posterior to the subclavius muscle and the medial part of the clavicle, the subclavian vein is at the highest risk of injury in the above patient.As a direct tributary of the brachiocephalic vein, it’s injury poses a high risk of massive bleeding.The brachiocephalic vein rests on the first rib, below and in front of the third part of the subclavian artery, and then on scalenus anterior which separates it from the second part of the artery (posteriorly).Anatomy of the clavicle:The clavicle extends from the sternum to the acromion and helps prevent the shoulder falling forwards and downwards.

Tinea incognitoť is a term used to describe a tinea infection modified by topical steroids. It is caused by prolonged use of topical steroids, sometimes prescribed as a result of incorrect diagnosis. Topical steroids suppress the local immune response and allow the fungus to grow easily. As a result, the fungal infection may take on the bizarre appearance seen in this patient.The diagnosis of tinea incognito is simple to confirm by microscopic visualization of branching hyphae and spores typical of dermatophytes in a potassium hydroxide preparation.Treatment of tinea incognito requires cessation of all topical steroid use and implementation of specific antifungal treatment. A low-potency corticosteroid may be used briefly to avoid the flare often associated with abrupt cessation of a potent steroid. Patients should be warned of this possibility so they do not reinstitute use of topical steroids on their own.

The most probable cause for the child’s presenting symptoms and the findings in ultrasound would be the presence of an abnormal posterior urethral valve. A posterior urethral valve is a developmental anomaly that usually affects male infants (incidence 1 in 8000) leading to obstructive uropathy. Diagnostic features include bladder wall hypertrophy, hydronephrosis and bladder diverticula.Note:Posterior urethral valves are the most common cause of infra-vesical outflow obstruction in males. They can be diagnosed on antenatal ultrasonography. Due to the necessity of the fetal bladder to develop high emptying pressures in utero secondary to this anomaly, the child may develop renal parenchymal damage. This leads to renal impairment noted in 70% of boys at the time of presentation. Management:The immediate treatment would be to place a bladder catheter to relieve the acutely retained urine. The definitive treatment of choice would be an endoscopic valvotomy with a cystoscopic and renal follow up.

The thyroid gland is one of the first endocrine glands to develop, and is formed from the endoderm of the epithelial tissue of the primitive pharynx. The mature gland is functionally made up of follicles with colloid which contain the pro hormone thyroglobulin. Thyroid hormone is synthesised at a cellular level and is stored as thyroglobulin, before its release as thyroid hormone, a major modulator of metabolism. In between the follicular cells are parafollicular, or C-cells which secrete parathyroid hormone or calcitonin which are responsible for calcium regulation in the body.

Neonatal hypoglycaemia is a serious condition that needs prompt attention and management. The accepted criteria to define neonatal hypoglycaemia is blood sugar levels less than 2.2mmol/L during the first 3 days of life and less than 2.5mmol/L later on. Multiple aetiologies and various risk factors are involved in causing hypoglycaemia in new-borns; the most common and important causes include prematurity, erythroblastosis fetalis, hypoxia at birth, sepsis, inborn errors of metabolism, hypopituitarism, and hyperinsulinism due to maternal diabetes. Inborn errors of metabolism that lead to persistent neonatal hypoglycaemia are maple syrup urine disease, glycogen storage disease, fatty acid enzyme deficiencies, and fructose intolerance. Phenylketonuria does not cause hypoglycaemia.

Case control studies are used to determine the relationship between exposure to a risk factor and the resultant outcomes. It finds patients in the general population who have a certain condition and retrospectively searches for past exposure to possible risk factors for the disease. Controls are people who do not have the disease found in the general population. This type of study is useful for rare diseases, and is less time consuming to conduct. While cohort studies can be used to study rare diseases they measure the relative risk of developing the disease over time based on exposure. Ecological or cross-sectional studies attempt take a snapshot of a whole population, and thus are inappropriate for rare diseases as larger sample numbers are needed. A randomised control trial is better suited to determine the effect of an intervention.

Time- EventWeek 1: ImplantationWeek 2: Formation of bilaminar diskWeek 3: Formation of primitive streakFormation of notochordGastrulationWeek 4: Limb buds begin to formNeural tube closesHeart begins to beatWeek 10: Genitals are differentiated

Answer: Surveillance annual flexible sigmoidoscopy from age 13 years until age 30 years. Familial adenomatous polyposis (FAP) is the most common adenomatous polyposis syndrome. It is an autosomal dominant inherited disorder characterized by the early onset of hundreds to thousands of adenomatous polyps throughout the colon. If left untreated, all patients with this syndrome will develop colon cancer by age 35-40 years. In addition, an increased risk exists for the development of other malignancies.Most patients with FAP are asymptomatic until they develop cancer. As a result, diagnosing presymptomatic patients is essential.Of patients with FAP, 75%-80% have a family history of polyps and/or colorectal cancer at age 40 years or younger.Nonspecific symptoms, such as unexplained rectal bleeding (haematochezia), diarrhoea, or abdominal pain, in young patients may be suggestive of FAP.In a minority of FAP families a mutation cannot be identified and so annual flexible sigmoidoscopy should be offered to at risk family members from age 13-15 years until age 30, and at three to five year intervals thereafter until age 60 years.

Individuals with Marfan syndrome are usually tall and slender, have elongated fingers and toes (arachnodactyly), loose joints, and have an arm span that exceeds their body height. Other common features include a long and narrow face, crowded teeth, an abnormal curvature of the spine (scoliosis or kyphosis), stretch marks (striae) not related to weight gain or loss, and either a sunken chest (pectus excavatum) or a protruding chest (pectus carinatum). Some individuals develop an abnormal accumulation of air in the chest cavity that can result in the collapse of a lung (spontaneous pneumothorax). A membrane called the dura, which surrounds the brain and spinal cord, can be abnormally enlarged (dural ectasia) in people with Marfan syndrome. Dural ectasia can cause pain in the back, abdomen, legs, or head. Most individuals with Marfan syndrome have some degree of near-sightedness (myopia). Clouding of the lens (cataract) may occur in mid-adulthood, and increased pressure within the eye (glaucoma) occurs more frequently in people with Marfan syndrome than in those without the condition.

IgA nephropathy’s characteristic presentation is haematuria following a non-specific upper respiratory infection as was evident in this case. IgA nephropathy also usually occurs in children and young males, like this patient.

This clinical picture is typical of chickenpox, which is treated with antihistamines and calamine lotion. In the case of fever, acetaminophen can be used. Generally treatment is purely for symptomatic relief.

Lorazepam is known to cause respiratory depression and finally apnoea as a side effect.

The most probable cause for the patient’s symptoms is intussusception.Intussusception is a condition in which part of the intestine folds into the section next to it. It most commonly involves the small bowel and rarely the large bowel. Intussusception doesn’t usually require surgical correction. 80% of cases can be both confirmed and reduced using barium, water-soluble or air-contrast enema. However, up to 10% of cases can experience recurrence within 24 hours after reduction, warranting close monitoring during this period.Other options:- Enteric duplication: a duplication cyst could give all these features, although it may contain sufficient gastric epithelium to produce a positive Meckel’s scan. However, this is comparatively rare. – Meckel’s diverticulum: Scintigraphy has poor sensitivity making the possibility of a bleed from a Meckel’s diverticulum a genuine differential for this patient. However, considering the presence of features of bowel obstruction in the patient, a Meckel’s diverticulum bleeding and obstructing at the same time would be a rare phenomenon. – Midgut volvulus: It is also a plausible differential in this patient. However, for the given age group, a midgut volvulus is relatively uncommon compared to intussusception. – Acute appendicitis: While it is true that appendicitis can present acutely with a palpable mass and bowel obstruction, it rarely presents with rectal bleeding.

Familial adenomatous polyposis can have different inheritance patterns.When familial adenomatous polyposis results from mutations in the APC gene, it is inherited in an autosomal dominant pattern, which means one copy of the altered gene in each cell is sufficient to cause the disorder. In most cases, an affected person has one parent with the condition.When familial adenomatous polyposis results from mutations in the MUTYH gene, it is inherited in an autosomal recessive pattern, which means both copies of the gene in each cell have mutations. Most often, the parents of an individual with an autosomal recessive condition each carry one copy of the mutated gene, but do not show signs and symptoms of the condition.

The presentation of the patient and the characteristic ring-like (Bull’s eye) rash are highly suggestive of a diagnosis of Lyme disease caused by Borrelia burgdorferi. The spirochete is transmitted by Ixodid ticks. The initial presentation of this infection includes an erythema migrans rash that starts from the site of tick bite and gradually expands. Other features supporting the diagnosis are the history of camping, fever, joint pain, and the neurological symptoms presenting as facial nerve palsy.

Congenital hypothyroidism results from insufficient levels of thyroid hormone in the body since birth, which is either due to dysgenesis of the thyroid gland or dyshormonogenesis. The important features of this disease include coarse facial features (macroglossia, large fontanelles, depressed nasal bridge, hypertelorism, etc.), failure to thrive, cardiomegaly, hypotonia, umbilical hernia, and low core body temperature among many others. Frontal bossing is the usual feature of rickets and acromegaly. Mitral regurgitation is not usually associated with congenital hypothyroidism.

Developmental milestones at 4 months of age:Social and Emotional:Smiles spontaneously, especially at people Likes to play with people and might cry when playing stops Copies some movements and facial expressions, like smiling or frowningLanguage/CommunicationBegins to babble Babbles with expression and copies sounds he hears Cries in different ways to show hunger, pain, or being tiredCognitive (learning, thinking, problem-solving)Lets you know if he is happy or sad Responds to affectionReaches for a toy with one hand Uses hands and eyes together, such as seeing a toy and reaching for it Follows moving things with eyes from side to side Watches faces closely Recognizes familiar people and things at a distance Movement/Physical DevelopmentHolds head steady, unsupported Pushes down on legs when feet are on a hard surface May be able to roll over from tummy to back Can hold a toy and shake it and swing at dangling toys Brings hands to mouth When lying on stomach, pushes up to elbows

People with Systemic Juvenile Idiopathic Arthritis (also known as Stills disease) can have recurrent fevers, a macular rash, joint pain, joint deformities, an enlarged liver and/or spleen, and can occasionally have polyserositis, lung involvement or pericardial effusions. Rheumatoid factor and antinuclear antibodies are usually negative. Treatment is with non-steroidal anti-inflammatory drugs (NSAIDs) and the prognosis is better than for adult rheumatoid arthritis.In pauciarticular Still’s disease, antinuclear antibodies are present. Large joints are affected and most patients develop classic features of seronegative spondylarthritis.

While the clinical scenario and the anosmic presentation of the child are highly suggestive of Kallmann’s syndrome, reduced testosterone, FSH and LH levels can confirm the diagnosis.Kallman’s syndrome is a recognised cause of delayed puberty secondary to hypogonadotropic hypogonadism. It is usually inherited as an X-linked recessive trait. Kallman’s syndrome is thought to be caused by a failure of GnRH-secreting neurons to migrate to the hypothalamus.Clinical features of Kallmann’s syndrome include:- Delayed puberty- Hypogonadism, cryptorchidism- Anosmia- Low sex hormone levels – Inappropriately low/normal LH and FSH levels- Some patients can present with associated cleft lip/palate and visual/hearing defects.

The differentials of the child’s condition are likely to include an Iron deficiency anaemia, or a hemoglobinopathy such as sickle cell disease or thalassemia based on the presentation of pallor, growth failure and easy fatiguability. While the full blood count and film present a hypochromic microcytic anaemia with reticulocytosis, the normal serum ferritin levels rule out iron deficiency anaemia. Thalassemia is to be suspected over sickle cell disease as the patient comes from the Mediterranean region known for a high incidence of thalassemia. Sickle cell anaemia also tends to present with normocytic normochromic red blood cells, with many sickled cells. Vitamin B12 deficiency and Aplastic anaemia are ruled out as they present with a macrocytic anaemia, and a decrease in white blood cells, platelets and red blood cells respectively.

Orbital bone fracture: The child has sustained a head injury and subsequently describes a CSF rhinorrhoea (indicating a cerebro-spinal fluid leak). CSF rhinorrhoea can occur in skull or nasal bone fractures. Given the symptoms of loss of consciousness and headache, this child is more at risk of having suffered a skull fracture requiring emergency CT head investigation and specialist neurosurgical management. An ethmoid bone fracture may also present this way. A skull x ray would help to determine an air fluid level and indeed allow some visualisation of the nasal bones, though in children the nasal bones do not visualise well due to lack of fusion. Either way this child would need assessment in the nearest Emergency Department and the school would be expected to follow a ‘head injury’ protocol.

Recurrent bacterial infections may be due to lack of B-cell function, consequently resulting in a lack of gamma globulins production. Once the maternal antibodies have depleted, the disease manifests with greater severity and is called x-linked agammaglobulinemia also known as ‘X-linked hypogammaglobulinemia’, ‘XLA’ or ‘Bruton-type agammaglobulinemia. it is a rare x linked genetic disorder that compromises the bodies ability to fight infections. Acute leukaemia causes immunodeficiency but not so specific. DiGeorge syndrome is due to lack of T cell function. Aplastic anaemia and EBV infection does not cause immunodeficiency.

Cataracts in infants are most commonly identified by an abnormal red reflex. Due to the high risk of amblyopia in unilateral cataracts, prompt referral to a paediatric ophthalmologist is indicated. Bilateral cataracts may occur in association with several syndromes or diseases, and these children require evaluation for these systemic disorders.Retinoblastoma is rare, but it is the most common primary intraocular tumour in children. About 80% of cases are diagnosed before age 4, with a median age at diagnosis of 2 years. It most frequently presents due to an abnormal red reflex. It is one of the few life-threatening disorders encountered in paediatric ophthalmology. Intraocular retinoblastoma is very treatable, but the mortality for metastatic disease is high. Identification of tumours before systemic spread is critical. Most children with large unilateral tumours will require enucleation (surgical removal of the eye), but the eye and vision may sometimes be preserved if the tumours are identified when they are small.

Sturge-Weber syndrome (SWS), also called encephalotrigeminal angiomatosis, is a neurocutaneous disorder with angiomas that involve the leptomeninges (leptomeningeal angiomas [LAs]) and the skin of the face, typically in the ophthalmic (V1) and maxillary (V2) distributions of the trigeminal nerve. The hallmark of SWS is a facial cutaneous venous dilation, also referred to as a nevus flammeus or port-wine stain (PWS).Signs and symptoms:SWS is generally diagnosed clinically, based on the typical cutaneous, central nervous system (CNS), and ocular abnormalities associated with it.Neurological signs include the following:Developmental delay/intellectual disabilityLearning problemsAttention deficit-hyperactivity disorderInitial focal seizures progressing to frequent, secondarily generalized seizuresIncreasing seizure frequency and duration despite the use of antiepileptic drugs (AEDs)Increasing duration of a transient postictal deficitIncrease in focal or diffuse atrophy – Determined by serial neuroimagingProgressive increase in calcificationsDevelopment of hemiparesisDeterioration in cognitive functioningPhysical signs of SWS are as follows:Port-wine stainMacrocephalyOcular manifestationsSoft-tissue hypertrophyHemiparesisVisual lossHemianopsiaOcular involvement in SWS may include the following signs:BuphthalmosGlaucomaTomato-catsup colour of the fundus (ipsilateral to the nevus flammeus) with glaucomaConjunctival and episcleral haemangiomasDiffuse choroidal haemangiomasHeterochromia of the iridesTortuous retinal vessels with occasional arteriovenous communications

The most probable diagnosis in this patient would be febrile seizure plus syndrome.Rationale:All of the answers are possible epileptic conditions that this 8-year-old may have. However, the background history of febrile seizure together with a family history of febrile seizures, in a boy who is growing well, with no developmental delay, make febrile seizures plus the most appropriate differential diagnosis for this patient.Other options:- Epilepsy with myoclonic absences are often challenging to treat and may continue into adulthood. There is a male predominance (70%). At presentation, approximately half of cases have a learning disability. An absence seizure is common in this diagnosis and usually occurs daily.- Juvenile absence epilepsy may present with initial generalised tonic-clonic epilepsy followed by absences after that. They are also seen with a background of febrile seizure, and the peak age of presentation is usually at eight years old. Given the current history and lack of absences, this diagnosis is least likely.- Juvenile myoclonic epilepsy usually presents with a myoclonic seizure, although the presentation maybe with a generalised tonic-clonic seizure. It occurs more frequently. Background history of febrile fit may be present in 5-10% of the cases.- Temporal lobe epilepsy is usually associated with aura, and that is not seen in this patient.

Intussusception is an urgent condition that must be excluded first as it may lead to life-threatening complications.

Autism is a neurodevelopmental disorder characterized by difficulties with social interaction, language delays, and some repetitive behaviours. Autism may be associated with some dysmorphic facial features, including macrocephaly, which denotes an abnormally large head. Macrocephaly is usually most observable during early childhood. The other features mentioned are not found to be associated with autism.

Celiac disease has characteristic shortened intestinal villi. When patients with celiac disease eat products containing gluten, they are unable to absorb the nutrients due to flattened or shortened intestinal villi. The blistering rash present on the patient’s elbows strongly suggests celiac disease. This rash is a sign of the condition Dermatitis Herpetiformis which is associate with celiac disease. Therefore, it is also often called ‘gluten rash’.