title: Primary retroperitoneal extraosseous osteogenic sarcoma: A case report and review of the literature.
abstract: A case of retroperitoneal extra-osseous osteogenic sarcoma is reviewed, as well as the criteria necessary for the diagnosis. The general characteristics and the differential diagnosis of the tumor are also presented.
mesh_terms: D000368:Aged; D003937:Diagnosis, Differential; D006801:Humans; D008297:Male; D009221:Myositis Ossificans / Q000175:diagnosis; D012516:Osteosarcoma / Q000175:diagnosis* / Q000473:pathology; D012186:Retroperitoneal Neoplasms / Q000175:diagnosis* / Q000473:pathology