title: Primary mesenteric extraskeletal osteosarcoma in the pelvic cavity.
abstract: A middle-aged man was being investigated for constipation. Abdominal radiographs incidentally revealed a large, densely calcified, rounded mass within the pelvic cavity. A CT scan was performed followed by surgical excision with a differential diagnosis of calcified hematoma and an enlarged calcified lymph nodal mass. Histopathological investigation revealed a primary mesenteric extraskeletal osteosarcoma. To the best of our knowledge, a primary extraskeletal osteosarcoma arising from the mesentery has not been described previously in the English literature. The radiological features and differential diagnosis are discussed.
authors.affiliation: Department of Radiology, Vancouver General Hospital, 899 West 12th Avenue, Vancouver, BC, V5Z 1M9, Canada. hnalinic@yahoo.com
authors.forename: H N
authors.initials: HN
authors.lastname: Choudur
authors.forename: P L
authors.initials: PL
authors.lastname: Munk
authors.forename: T O
authors.initials: TO
authors.lastname: Nielson
authors.forename: A G-M J
authors.initials: AG
authors.lastname: Ryan
mesh_terms: D006801:Humans; D008297:Male; D008643:Mesentery; D008875:Middle Aged; D012516:Osteosarcoma / Q000000981:diagnostic imaging* / Q000473:pathology* / Q000601:surgery; D010534:Peritoneal Neoplasms / Q000000981:diagnostic imaging* / Q000473:pathology* / Q000601:surgery; D011859:Radiography