Bizarre parosteal osteochondromatous proliferation: Case report and reviewof the literature

Bizarre parosteal osteochondromatous proliferation of bone (BPOP) is a beni gn lesion that is occasionally misinterpreted as a malignant process. The o riginal reports described lesions exclusively in the hands and feet. Howeve r, subsequent reports have included additional sites in the long bones, sku ll, and maxilla. The differential diagnosis of BPOP includes numerous benig n and malignant lesions. The benign differential diagnosis includes osteoch ondroma and reactive processes. The most important malignant differential d iagnosis is parosteal osteosarcoma. We present a case of an 11-year-old boy with recurrent BPOP and review the literature. We discuss the differential diagnosis and pathogenesis of the lesion.