A 15-YEAR-OLD boy had recurrent colicky lower abdominal pain sometimes accompanied by nonbloody diarrhea. The episodes of pain lasted from hours to several days. His temperature was always normal and he did not vomit. During the last 2 years the patient had gained neither weight nor height. Physical examination revealed lower abdominal tenderness. Results of flexible sigmoidoscopy and biopsy were normal. Computed tomography of the abdomen showed a large lesion in the cecocolic area (Figure 1 and Figure 2). Enteroclysis supported the diagnosis of a large mass in the cecum and ascending colon ( Figure 3). At colonoscopy the mass was visualized ( Figure 4).