History A 10-year-old boy has been brought to the emergency department by his father. The youngster was in a playground when he developed a swollen and painful right knee. The boy describes recurrent episodes of pain and swelling in his knees and shoulders over the last year or so. He cannot remember any history of trauma. He does, however, have a history of multiple blood transfusions but he is unsure of the reason for these.

Examination The boy has painful, tensely swollen, warm and diffusely tender knee and shoulder joints (image attached). He also has multiple bruises over his legs and arms. What is the likely diagnosis from the image? *This image based case is from Docplexus for educative purpose only Source: Quizlet Stay Connected, the answer will be published in next 48h!