2nd September 2020

A 15-year-old Armenian boy presents with his grandmother to A&E with a 1-day history of severe abdominal pain

A 15-year-old Armenian boy presents with his grandmother to A&E with a 1-day history of severe abdominal pain, as well as a fluctuating fever of up to 39 degrees centigrade, and a severe right-sided knee pain despite reporting no trauma. On questioning, his grandmother reports the boy’s father suffered from something similar around the same age. 

For the patient above, please select the SINGLE most likely diagnosis. Select ONE option from the list above.