title: [Retroperitoneal dedifferentiated liposarcoma extending into the iliocostal muscle and the quadratus lumborum muscle accompanied with bone formation: case report].
abstract: A 72-year-old man with back pain on the left side was admitted. Imaging analysis revealed a retroperitoneal mass and a mass in the left iliocostal muscle and the left quadratus lumborum muscle. The two masses could not be resected en bloc, and were resected separately. The clinicopathological findings of these tumors revealed dedifferentiated liposarcoma. The primary dedifferentiated liposarcoma appeared to have originated from the retroperitoneal space extending into the iliocostal muscle and the quadratus lumborum muscle. Then the mass was thought to have formed accompanied with osteogenesis.
authors.affiliation: Department of Urology, Matsusaka City Hospital.
authors.forename: H
authors.initials: H
authors.lastname: Matsuura
authors.forename: M
authors.initials: M
authors.lastname: Sakurai
authors.forename: K
authors.initials: K
authors.lastname: Arima
mesh_terms: D000368:Aged; D006801:Humans; D008080:Liposarcoma / Q000473:pathology* / Q000601:surgery; D008297:Male; D019042:Muscle Neoplasms / Q000473:pathology*; D009361:Neoplasm Invasiveness; D010012:Osteogenesis; D012186:Retroperitoneal Neoplasms / Q000473:pathology* / Q000601:surgery