title: Extraosseous osteosarcoma - two cases.
abstract: Two patients with extraosseous osteosarcoma of the gluteal region are presented. In one early case liquifaction of the tumour delayed the diagnosis due to confusion with a cold abscess. In the second patient the tumour developed in a region that had been subjected to post-operative radiotherapy for a uterine carcinoma seven years earlier. In both patients the tumour developed rapidly and with a fatal outcome only a few months after apparently satisfactory local excision.
mesh_terms: D002081:Buttocks; D005260:Female; D006801:Humans; D008875:Middle Aged; D009364:Neoplasm Recurrence, Local / Q000175:diagnosis; D009381:Neoplasms, Radiation-Induced / Q000175:diagnosis; D012516:Osteosarcoma / Q000175:diagnosis* / Q000601:surgery; D012983:Soft Tissue Neoplasms / Q000175:diagnosis* / Q000601:surgery