[Retroperitoneal mixed type liposarcoma: a case report].

Primary retroperitoneal tumors are reported to account for 0.2% of all malignancies. Furthermore, 10-20% of all primary retroperitoneal tumors are liposarcomas. Up to 1989, 213 cases of retroperitoneal liposarcoma have been reported in the Japanese literature to our knowledge. Mixed type liposarcomas were rare, and composed 13.8% of all retroperitoneal liposarcomas in this series. We described her…