[A Case of Long-Term Survival Despite Positive Margins after Resection of Recurrent Mesenteric Liposarcoma].

We report the case of an 87-year-old woman with a long-term prognosis after resection of a recurrent mesenteric liposarcoma. She was diagnosed with mesenteric tumor and rectal cancer and underwent simultaneous resection. Postoperative pathological examination revealed Stage Ⅰ rectal cancer and the mesenteric tumor was found to be a liposarcoma with a mixture of dedifferentiated and well-differentiated types. A CT scan during follow-up showed a local recurrence of mesenteric liposarcoma. Thirty months after the initial surgery, the recurrent tumor was resected. Postoperative pathology showed positive margins with a diagnosis of only well-differentiated liposarcoma. Chemotherapy was not administered, but there was no evidence of recurrence 52 months after surgery. We considered that positive resection margins of well-differentiated liposarcoma in elderly patients suggested that strict follow-up may be acceptable.