Combined Endoscopic Mucosal Resection and Extended Laparoscopic Appendectomy for the Treatment of Periappendiceal,...

Surgical resection is the gold standard in the treatment of neoplasia involving the appendiceal orifice (Ao). Endoscopic mucosal resection (EMR) of adenomas involving the Ao can be challenging because of the risk of appendicitis, perforation, or incomplete resection. Surgical resection of Ao lesions is limited by the difficulty of ensuring a negative lateral margin without compromising the ileocecal valve and usually necessitates ileocecal resection. Although combined endoscopic and laparoscopic surgery has become more widely accepted for a variety of conditions, a structured approach to lesions involving the Ao has yet to be described. We describe a novel approach to the treatment of periappendiceal, cecal, and appendiceal adenomas-and present an algorithm to guide decision-making regarding the application of these techniques.

All patients referred to our therapeutic endoscopy practice with tumors involving the Ao between August 2013 and July 2017 were included. Based on tumor size and involvement of the os, patients were either referred for extended laparoscopic appendectomy (ELA), EMR, or a combined approach.

In total, 47 patients were included; 25 patients underwent EMR only, 13 patients underwent ELA only, and nine patients underwent combined resection. Two patients undergoing EMR had postpolypectomy syndrome. One EMR-only patient with a positive lateral margin was referred for appendectomy, but declined. No patient required ileocecectomy. Pathologic examination revealed a high rate of sessile serrated adenoma (SSA; 36%).

Our results introduce a decision algorithm and suggest that EMR combined with ELA is a safe and curative technique for the treatment of large cecal adenomas involving the Ao.