Mesenteric fibromatosis in Crohn's disease.

We have seen two patients with Crohn's disease and mesenteric fibromatosis, the least common form of desmoid tumor. Although both gastrointestinal and nongastrointestinal tumors are relatively common in Crohn's disease, this type of tumor has not been seen in > 1,650 patients operated on for this condition. As the only common factor in the two male patients discussed in this article was previous intestinal resections, surgical trauma may be a predisposing factor in the occurrence of these desmoid tumors. We will continue to search for other examples in patients with Crohn's disease.