title: Extraskeletal osteosarcoma arising in the buttock.
abstract: Extraskeletal osteosarcoma is a rare sarcoma that accounts for about 1% of malignant soft tissue tumours. We report an very unusual case of a small-size extraskeletal osteosarcoma arising in the superficial subcutaneous region of the buttock. The patient was a 55 year-old female. She incidentally noticed a small nodule in the right trochanteric region. It was removed under local anesthesia at a private clinic. An additional wide excision was performed at our hospital. There was an 8 mm? 10 mm mass in the subcutaneous tissue. No invasion of the underlying fascia was observed. Microscopic examination of the removed tumour showed bizarre-looking spindle and giant cells with lace-like osteoid. The tumour was diagnosed as extraskeletal osteosarcoma. Chemotherapy with Rosen T-20 was administered to the patient. The patient has survived without recurrence or metastasis for 4 years since the primary surgery. Its superficial location, very small size, wide excision, and chemotherapy were thought to contribute to her long survival.
authors.affiliation: Department of Orthopaedic Surgery, Tohoku University School of Medicine, Sendai, Japan.
authors.forename: M
authors.initials: M
authors.lastname: Oonuma
authors.forename: M
authors.initials: M
authors.lastname: Hatori
authors.forename: M
authors.initials: M
authors.lastname: Hosaka
authors.forename: S
authors.initials: S
authors.lastname: Kokubun
mesh_terms: D002081:Buttocks; D005260:Female; D006801:Humans; D008875:Middle Aged; D012516:Osteosarcoma / Q000473:pathology*; D012878:Skin Neoplasms / Q000473:pathology*