title: [Two cases of retroperitoneal liposarcoma arisen from perirenal fat tissue, which could not be diagnosed preoperatively].
abstract: We report two cases of retroperitoneal liposarcoma arisen from the perirenal fat tissue, which could not be diagnosed preoperatively. Case 1 is a 58-year-old male. He complained of left flank tumor. Computed tomography and magnetic resonance image showed a mass over 10 cm that contained fat components in the retroperitoneal space. The tumor was resected with left nephrectomy and histological examination revealed well differentiated liposarcoma. As adjuvant therapy, he received chemotherapy and 30 months has passed uneventfully. Case 2 is a 70-year-old male. Screening ultrasonography revealed incidental retroperitoneal tumor. With clinical diagnosis as non-functioning adrenal tumor, he received left nephrectomy. The pathological diagnosis was well differentiated liposarcoma, sclerosing type. No adjuvant therapy was performed. He has stopped visiting our clinic due to aggravation of heart disease. The characteristics of the images of the two cases were different despite the histological resemblance. This difference was considered to be due to the difference in the distribution of lipomatous tissue in each patient.
authors.affiliation: Department of Urology, Yokosuka Kyousai Hospital.
authors.forename: Atsushi
authors.initials: A
authors.lastname: Hamano
authors.forename: Yuzoh
authors.initials: Y
authors.lastname: Yamashita
authors.forename: Yoshitake
authors.initials: Y
authors.lastname: Katoh
authors.forename: Yasushi
authors.initials: Y
authors.lastname: Yumura
authors.forename: Kunihisa
authors.initials: K
authors.lastname: Mikata
authors.forename: Kazunori
authors.initials: K
authors.lastname: Takase
authors.forename: Yoshiharu
authors.initials: Y
authors.lastname: Ohgo
authors.forename: Sumio
authors.initials: S
authors.lastname: Noguchi
authors.forename: Yohji
authors.initials: Y
authors.lastname: Nagashima
mesh_terms: D000273:Adipose Tissue / Q000473:pathology*; D000368:Aged; D000971:Antineoplastic Combined Chemotherapy Protocols / Q000008:administration & dosage / Q000627:therapeutic use; D002945:Cisplatin / Q000008:administration & dosage; D004334:Drug Administration Schedule; D015251:Epirubicin / Q000008:administration & dosage; D006801:Humans; D007668:Kidney / Q000473:pathology*; D008080:Liposarcoma / Q000175:diagnosis* / Q000188:drug therapy / Q000473:pathology; D008279:Magnetic Resonance Imaging; D008297:Male; D008727:Methotrexate / Q000008:administration & dosage; D008875:Middle Aged; D012186:Retroperitoneal Neoplasms / Q000175:diagnosis* / Q000188:drug therapy / Q000473:pathology; D014057:Tomography, X-Ray Computed
chemical_list: D015251:Epirubicin; D002945:Cisplatin; D008727:Methotrexate