title: Retroperitoneal extraskeletal osteosarcoma.
authors.forename: F J
authors.initials: FJ
authors.lastname: Wesseling
authors.forename: R T
authors.initials: RT
authors.lastname: Tjon A Tham
authors.forename: W
authors.initials: W
authors.lastname: Breed
authors.forename: P J
authors.initials: PJ
authors.lastname: Klinkhamer
mesh_terms: D000328:Adult; D006801:Humans; D008297:Male; D012516:Osteosarcoma / Q000175:diagnosis*; D012186:Retroperitoneal Neoplasms / Q000175:diagnosis*