The common causes of lower gastrointestinal bleeding in children are intussusception, rectal juvenile polyp, chronic inflammatory colitis and Meckel's diverticulum. Bleeding from Dieulafoy's ulcer at the lower gastrointestinal tract is rare, but this often occurs in the rectum. So far, there has been no report that a Dieulafoy lesion in the ileocecal valve might be formed after acute colitis in a pediatric patient. In this case report, a Dieulafoy-like lesion at the ileocecal valve caused lower gastrointestinal bleeding in an asymptomatic 14-year-old woman. A careful history taking and medical examination are mandatory to identify the bleeding focus in the GI tract and this can be treated by endoscopy. (Korean J Gastrointest Endosc 2009;39:166-168)