The roentgenologic features of small intestinal carcinoid tumors have received little attention in the literature compared to their clinical and potential pharmacologic manifestations. Eighteen proven cases were analyzed. A variety of roentgenologic appearances may be present, reflecting the growth patterns and tissue reaction incited by the tumor. Roentgenologic appearances vary from solitary or multiple submucosal nodules to extensive mesenteric desmoplasia without demonstration of a tumor mass. Some manifestation of the desmoplastic reaction is the most common roentgen finding. Because of the nonspecific clinical findings, the radiologist will often have the first opportunity to suggest the diagnosis.