[A Case of Retroperitoneal Primary Well-Differentiated Liposarcoma Treated by Laparoscopic Surgery].

: A 76-year-old woman visited the hospital due to occult blood in her urine. An abdominal CT scan showed a low-density tumor inside the left iliopsoas muscle in the retroperitoneum, and a well-differentiated liposarcoma was suspected. Therefore, laparoscopic tumor resection was performed. The tumor was on the inside of the left iliopsoas muscle, without any invasion around it. The macroscopic appearance of the resected tumor showed a yellow, fat-like, solid mass and it was histopathologically diagnosed as a well-differentiated liposarcoma. We conclude that a retroperitoneal primary well-differentiated liposarcoma can be treated by laparoscopic surgery, as in our case.