Non-Hodgkin's lymphoma presenting as a rectal polyp in a child.

Primary lymphoma of the rectum is extremely rare in children. We report here a 10-year-old boy with localized non-Hodgkin's lymphoma, discovered within a rectal polyp. The literature on childhood rectal lymphomas is reviewed. This case illustrates the importance of considering the possibility of malignancy with rectal polyps, even in children.