Serrated Adenoma of Appendix Synchronous with Invasive Adenocarcinoma of Transverse Colon: Both are Microsatellite Instability-Negative: Case Report

sociated with serrated adenoma is a distinct type of colorectal neoplasm, accounting for 5.8% of all colorectal carcinoma cases.1 Thus, we reported this case for that a serrated adenoma was detected in the appendix of a subtotal colectomy specimen with colon cancer. The group of serrated polyps is classified into three lesions as; hyperplastic polyps, sessile serrated adenomas/polyps and traditional serrated adenomas.2 Traditional serrated adenoma (TSA) is classified in the serrated polyps group. Traditional serrated adenomas are usually pedunculated, villiform, with the di-