MSFinals-2605
A 49-year-old man presents to the Emergency Department with right-sided flank pain radiating to the back which had developed over the past 10 days. There is no history of trauma or injury to the area.
He is a known intravenous drug user who has been commenced on a methadone rehabilitation programme around 2 weeks previously. He has no fixed abode and spends his night between various hostels.
He has no significant past medical history. Although has previous admissions following various injuries such as stabbings.
His observations are: heart rate 99/min, respiratory rate 16/min, blood pressure 98/75 mmHg, temperature 37.7º, Sats 99% on air.
On examination, he appears to be in pain and is lying flat on his back with his knees flexed. He is very tender over his back at L1 and L2 levels. He actively resists passive movement from his position of comfort and is unable to weight bear due to pain.
Blood tests show raised inflammatory markers, lumbar spine and pelvic x-ray show no abnormality.
He is requesting analgesia for his pain.
What is the most likely cause of this man’s symptoms?