Bizarre Parosteal Osteochondromatous Proliferation with Cortical Erosion in the Hand: A Case Report

Bizarre parosteal osteochondromatous proliferation (BPOP) is a rare benign lesion arising from the surface of cortical bone which usually occurs in the small bones of distal extremities and shows exophytic growth. Such a lesion can be cured by local excision. BPOP can be confused with some benign and malignant diseases such as osteochondroma, paraosteal osteosarcoma, or chondrosarcoma, both radiologically and pathologically (1). We illustrate imaging features including simple radiograph and magnetic resonance imaging of BPOP in the proximal phalanx of the hand with unusual cortical erosion and bone marrow edema accompanied by soft tissue enhancement.