An 18-year-old man was referred to the emergency department due to hematochezia for three days. The patient had no other symptoms. Hemoglobin level was 90 g/L. With negative results of gastroscopy and colonoscopy, he accepted computed tomography enterography, which indicated one nodular bulge in the ileum of the left pelvis (Fig 1a, 1b). Transanal double-balloon enteroscopy (DBE) disclosed a bifurcation of the intestinal tract (Fig 1c), a neoplasm occupied one cavity, which prevented the DBE from proceeding, and a superficial ulcer was formed near it (Fig 1d).