Intra-osseous ganglion. Report of four cases and review of the literature.

Intraosseous ganglia are histologically identical to their soft tissue counterparts. Most commonly seen adjacent to the hip, ankles, knee, or wrist, they are often mistaken for other neoplasms occurring in the epiphysis. We discuss the characteristic clinical, radiological, and pathologic features of four cases of intraosseous ganglia. Intraosseous ganglia should be included in the differential diagnosis of well-demarcated lucent epiphyseal lesions of bone.