腎被膜原発脂肪肉腫の1例

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58歳女.膵腫瘍の経過観察中CTで左腎腫瘍が発見された.血管造影で腫瘍の栄養血管を認めず,CT・MRIで腫瘍内部に不均一な脂肪様陰影を認めた.これらの所見から腎被膜腫瘍や膵腫瘍の腎転移などを疑って経腰的根治的左腎摘除術を行い,病理組織学的に腎被膜原発脂肪肉腫と診断した.術後3ヵ月の現在,再発・転移は認めていないA 58-year-old woman was referred to our institution for treatment of a left renal tumor revealed by follow-up computed tomography (CT) of a pancreatic tumor. The CT showed a heterogeneous, perirenal mass containing areas of fat density. Angiography showed no feeding artery. Left nephrectomy was performed and pathological examination revealed a well-differentiated liposarcoma of the renal capsule. At the third-month follow-up, the patient was completely asymptomatic and free of recurrence. Primary tumors of the renal capsule are uncommon and liposarcoma of the renal capsule is distinctly rare. There have been only 17 reports of liposarcoma arising from the renal capsule in Japan. We, herein, report a case of liposarcoma of the renal capsule.