Answer: E A 27-year-old male with no medical illness presented to the orthopaedic clinic with left knee pain since 1 week. There was no history of trauma. There was no tenderness or swelling on physical examination and the range of motion of the left knee was normal. Frontal and lateral radiographs of the left knee (Fig. 1) were obtained, which showed an eccentric and well defined radiolucent l...
