Endoscopic full-thickness resection of rectal schwannoma: A case report

Figure 1 Colonoscopy and abdominopelvic computed tomography. A: White light endoscopy; B: Narrow band imaging; C: Endoscopic ultrasonography (a small probe at 20 Hz) showing a hypoechoic mass originating from the muscularis propria with clear boundary; D: A well-circumscribed, well-enhanced, round-shaped mass was identified at the rectum; the main growth pattern was extraluminal growth (yellow arrow).

Figure 2 Endoscopic full-thickness resection and postoperative tumor. A: Stripping the submucous tumor during endoscopic full-thickness resection (EFTR); B: The wound surface after EFTR; C: Titanium clips were used to seal the wound surface after EFTR; D: An approximately 2.0 cm × 1.5 cm × 1.5 cm round mass was observed after EFTR, which was a solid mass with intact capsule.

Figure 3 Hematoxylin and eosin and immunohistochemical staining. A: The tumor cells were composed of spindle cells with low nuclear atypia; B: The Ki-67 proliferative index was 3%; C: The tumor was positive for S100; D: The tumor was positive for SOX-100.

Figure 4 Follow-up surveillance colonoscopy. A: White light endoscopy; B: Narrow band imaging.