A Case of Retroperitoneal Liposarcomas of Multicentric Origin

Naoki Futamura, Atsuyoshi Onitsuka, Masatomo Hayashi, Masaya Shibata, Ken-ichi Sakamoto, Mikio Yasumura, Hajime Hirose and Kuniyasu Shimokwa^*

First Department of Surgery and Department of Labolatory Medicine^*,

Gifu University School of Medicine

We report a case of retroperitoneal liposarcomas of probably multicentric origin with a lipoma in the sigmoid colon mesentery. A 57-year-old male underwent abdominal ultrasonography in September 1996. Mass lesions were detected in the left upper abdomen. Abdominal ultrasonography, CT and MRI demonstrated 2 mass lesions: one on the ventral side of the left kidney and one between the rostral end and the hilus of the left kidney. It was suggested that the tumor on the ventral side of the kidney was associated with adipose tissue. Surgery was performed under the preoperative diagnosis of liposarcoma. Two mass lesions in the retroperitoneum were confirmed during surgery: one on the ventral side of the left kidney and one between the rostral end and the hilus of the left kidney. The adipose tissue suggested by the imaging study proved to be an independent tumor located in the sigmoid colon mesentery. Pathological examination showed that the two mass lesions in the retroperitoneum were myxoid liposarcomas, while the tumor in the sigmoid colon mesentery was a lipoma. We considered that the retroperitoneal liposarcomas with the lipoma were of multicentric origin.

Key words
multicentric liposarcoma retroperitoneal liposarcoma

Reprint requests
Naoki Futamura Department of Surgery, Hashima City Hospital 3-246 Shinsei-cho, Hashima, 501-6206 JAPAN

Accepted
September 22, 1999

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