Ileal collision tumor associated with gastrointestinal bleeding: A case report and review of literature

Figure 1 Contrast-enhanced computed tomography of the abdomen. A: Partial invagination of the ascending colon suggests intussusception (orange arrow); B: The mass at the terminal ileum (orange arrow).

Figure 2 Colonoscopy examination. Submucosal elevation 6 cm from the ileocecal valve consists of two distinct parts with a clearly visible demarcation line.

Figure 3 Modified endoscopic submucosal dissection procedure. A: Endoscopic images showing the process of endoscopic submucosal dissection (ESD) for the tumor; B: Endoscopic images showing the purse-string suture closure of the excised tumor site after ESD; C: The resected mass.

Figure 4 Histopathological examination. A: Microscopic examination revealed a benign collision tumor (lipoma combined with juvenile polyp); B: The signs of angiodysplasia and bleeding on the surface of the lesion (orange arrow).