Two types of colorectal carcinoma in Crohn's disease

Fourteen examples of carcinoma developing in the colon or rectum were encountered in a series of 1008 patients with Crohn's disease treated in Aberdeen during the 34-year period, 1955-1988. Seven patients were under 55 years of age at the time of onset of Crohn's disease, and had a long history of the disease before carcinoma supervened. Older patients had short histories and a better prognosis. One squamous carcinoma may have arisen in relationship to a fistula in ano.