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.

/images/osteosarc1.jpg
/images/osteosarc2.jpg
/images/osteosarc3.jpg
/images/osteosarc4.jpg
/images/osteosarc5.jpg