A Case of Undifferentiated Pleomorphic Sarcoma of the Mesentery of the Ascending Colon

Abstract

A 40-year-old man was referred to our hospital with right upper quadrant abdominal pain and a palpable tumor in the right abdomen. Serum CRP was elevated and abdominal CT revealed a 13-cm clearly demarcated tumor with a low-density area on the anal side of the ascending colon. The abdominal pain failed to resolve with conservative therapy. Therefore, we performed emergent right hemi-colectomy. Histopathological examination of the resected specimen revealed the diagnosis of undifferentiated pleomorphic sarcoma (UPS). It has been reported that UPS arising from the colonic mesentery has a poor prognosis, but little is known about the prognosis or standard therapy of this condition. Recently, long-term survival of a case of UPS who underwent radical surgery was reported. Therefore, it is important for complete resection to be performed in patients with UPS ; we have reported our case with a review of the literature.