Retroperitoneal Liposarcoma Consisting of Three Different Histological Types—A Case Report—

Abstract

We report a case of mixed-type retroperitoneal liposarcoma consisting of three different histological types. A 58-year-old man was admitted to our hospital with the chief complaint of abdominal distension. Computed tomography (CT) and positron emission tomography (PET)-CT revealed a giant tumor occupying almost the entire abdominal cavity. Retroperitoneal liposarcoma was suspected and surgical resection was performed. The tumor was 30 × 20 × 15 cm in size and weighed 4,100 g. The pathological diagnosis was mixed-type retroperitoneal liposarcoma, consisting of well-differentiated, myxoid, and pleomorphic types in almost equal proportions. The present case was studied because of the rarity of retroperitoneal liposarcoma comprising three different histological types.