Intraosseous lipoma of the proximal radius with extraosseous extension and a secondary posterior interosseous nerve palsy.

We describe an unusual and previously unreported case of a histologically verified solitary intraosseous lipoma of the proximal radius with extraosseous tumor extension and a secondary posterior interosseous nerve palsy. A successful outcome was achieved after intralesional resection of the soft-tissue tumor extension, curettage of the proximal radius, autogenous cancellous bone grafting of the resultant intramedullary defect, and tendon transfers.