Two Case Reports of Desmoid Tumor with Postoperative Colorectal Cancer

Abstract

We report two cases of desmoid tumor with postoperative colorectal cancer. Case 1: A 69-year-old man underwent low anterior resection for Stage I rectal cancer. In CT scan at 14 months after operation, soft tissue tumor was found in the aortic bifurcation with slight uptake on FDG-PET (SUV max: 4.47). We diagnosed it as recurrence of colorectal cancer, and performed resection. Based on pathological findings, the tumor was diagnosed as desmoid tumor. Case 2: A 69-year-old man underwent laparoscopic left hemicolectomy for Stage IIb transverse colon cancer. In CT scan at 24 months after operation, a tumor was found in the mesenteric membrane with no uptake on FDG-PET (SUV max: 2.41). We diagnosed it as recurrence of colorectal cancer, and performed resection. Based on pathological findings, the tumor was diagnosed as desmoid tumor. Desmoid tumor with postoperative colorectal cancer is not only rare, but also difficult to distinguish from colorectal cancer recurrence.