Post-colonoscopy colorectal cancer rate in the era of high-definition colonoscopy

Figure 5 An advanced “missed or new” post-colonoscopy colorectal cancer case (No. 10 in Table 2). A: A 77-year-old woman underwent initial colonoscopy and a pedunculated adenomatous polyp 9 mm in size was resected; B: A large advanced cancer 50 mm in size was found in the recto-sigmoid colon at subsequent colonoscopy for hematochezia 12 mo later. Histopathological examination of the surgical specimen showed well to moderately differentiated adenocarcinoma invading the subserosa, and no lymph node metastasis.