Week 21: Case 6

1. Presented by Edward McCarthy, M.D. and prepared by Orin Buetens, M.D.

A 27 year-old woman had a painless swelling on the posterior aspect of her knee that had been growing for over a year. Radiographically, there was a radiodensity on the posterior aspect of the distal femur with a pattern of bone formation. The lesion was irregular in contour and fixed to the surface of the bone.