Ileal schwannoma developing into ileocolic intussusception

Figure 1 CT revealed a large, comparatively well-defined mass in the colon (arrow), and intussusception.

Figure 2 Colonoscopy revealed a large SMT, with an ulcerated apex covered with normal ileal mucosa, in the ascending colon.

Figure 3 Macroscopic findings of the tumor. A 75 mm × 43 mm × 34 mm pedunculated SMT arising from the ileum was observed.

Figure 4 Histological findings of the tumor. A: Proliferation of bizarre spindle-like tumor cells without mitotic figures (HE, × 20); B: Tumor cells were positive for S-100 protein.