title: Extraskeletal osteochondroma of the foot.
abstract: Extraskeletal osteochondroma, an infrequently encountered benign lesion, is described in 1 patient who presented with a slow-growing, relatively painful mass on the dorsal side of his right foot, in the 3rd toe web. Radiographs and magnetic resonance imaging studies demonstrated a radio-opaque extraskeletal mass. Excision biopsy revealed a well-defined and lobulated, firm, calcified, extraskeletal mass, which was easily enucleated. Histologic examination revealed mature chondroid tissues with bland-looking chondrocytes and ossified tissues. The diagnosis of an extraskeletal osteochondroma should be considered when a discrete ossified mass is localized in the soft tissues of the distal extremities. A case of pathologically proven extraskeletal osteochondroma is presented together with clinical, radiologic, and magnetic resonance imaging findings, and a literature review.
authors.affiliation: Division of Orthopedics, Department of Surgery, Far Eastern Memorial Hospital Banciao, Taipei, Taiwan, R.O.C.
authors.forename: Victor Ka-Siong
authors.initials: VK
authors.lastname: Kho
authors.forename: Wen-Chih
authors.initials: WC
authors.lastname: Chen
mesh_terms: D002869:Chromosome Aberrations; D005534:Foot Diseases / Q000235:genetics / Q000473:pathology*; D006801:Humans; D008279:Magnetic Resonance Imaging; D008297:Male; D008875:Middle Aged; D015831:Osteochondroma / Q000235:genetics / Q000473:pathology*; D012983:Soft Tissue Neoplasms / Q000235:genetics / Q000473:pathology*