Aggressive mesenteric fibromatosis. Case report.

A 34-year-old man was found to have rectal adenocarcinoma 4 years after diagnosis of mesenteric fibromatosis. Radical excision of the fibromatosis was not feasible and the fibromatous infiltration slowly progressed retroperitoneally, obstructing ureters and colon. Patients with abdominal fibromatosis may be at a risk of developing colonic carcinoma due to coexisting colonic adenomatosis.