[A Case of Symptomatic Giant Retroperitoneal Intramuscular Lipoma with Clinically Suspected Well-Differentiated...

Lipoma and well-differentiated liposarcoma are clinically differentiated by site of origin and length, and pathologically differentiated by immunostaining with MDM2 and CDK4. An 82-year-old male patient. A retroperitoneal lipomatous tumor which compressed intraabdominal organs was found on CT and MRI scan. Laparotomy for retroperitoneal tumor resection was performed. Lipomatous tumor more than 10 cm was extirpated. The pathological diagnosis was retroperitoneal intramuscular lipoma. One year after surgery, there is no sign of tumor recurrence.