29th September 2020

A 15-year-old boy presents with his father to his GP, complaining of easy bruising

A 15-year-old boy presents with his father to his GP, complaining of easy bruising and pain and crepitus in his hips. On examination he has several bruises but denies any injury and has atrophic scars which his father puts down to a chickenpox infection in infancy. 

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