Lymphangiomas of the gastrointestinal tract are extremely rare benign tumors. There have been 39 cases of solitary intestinal lymphangiomas reported, 8 of which were found in the duodenum; only 3 of these were seen radiographically. A case of cavernous lymphangioma of the duodenum is presented, the roentgenographic and pathologic findings are described, and the literature is reviewed.