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BPOPBizarre parosteal osteochondromatous proliferation of bone. A rare benign lesion which presents as a discrete bony mass near the cortical surface of small bones of the hands and feet, less commonly the ulna, radius, tibia, femur, fibula or humerus.
Generally asymptomatic; more common in young adults, some with a prior history of trauma.
Osteochondroma, parosteal osteosarcoma, myositis ossificans, periostitis.
Up to half of cases recur.