Serrated lesions of the appendix in serrated polyposis patients

Abstract

Patients with serrated polyposis develop multiple serrated polyps throughout the large bowel: hyperplastic polyps (HP), sessile serrated adenomas (SSA) and traditional serrated adenomas (TSA). The frequency and the characteristics of serrated lesions of the appendix have not been reported in serrated polyposis patients. We conducted a retrospective study of 34 serrated polyposis patients who underwent a total or right hemicolectomy for adenocarcinoma or polyp burden. An appendiceal serrated lesion was identified in 23 (68%): 13 SSAs, three SSAs with dysplasia, four HPs and three TSAs. The BRAFV600E mutation was present in four polyps, all of SSA subtype (one with dysplasia). KRAS mutations w..