Endoscopic and laparoscopic treatment of ileocecal laterally spreading tumor with concomitant appendiceal adenoma: A case report and review of literature.

Background: Ileocecal laterally spreading tumors (LSTs) complicated by appendiceal tubular adenoma are rare and challenging to diagnose because of the absence of typical symptoms and specific diagnostic signs. Traditionally, the primary treatment has been laparoscopic appendectomy (LA).

Case summary: A 63-year-old female presented with changes in bowel habits. Colonoscopy revealed an ileocecal LST. The patient underwent endoscopic submucosal dissection. Postoperative follow-up colonoscopy revealed mucosal elevation at the appendiceal orifice, with pathology confirming tubular adenoma. Abdominal computed tomography indicated a suspicious appendiceal tumor, leading to LA with partial cecectomy. The postoperative recovery was uneventful. At the 1-year follow-up, colonoscopy revealed no evidence of tumor recurrence.

Conclusion: Ileocecal LSTs with appendiceal tubular adenomas are traditionally treated with LA. endoscopic submucosal dissection can also yield favorable outcomes.