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

Figure 7 An advanced post-colonoscopy colorectal cancer case resulting from inadequate examination (No. 8 in Table 2). A 70-year-old woman underwent emergency colonoscopy with poor bowel preparation. A: No polyp was found in the colon but a quantity of residual stools covered the lower end of the cecum (arrow); B: Subsequent colonoscopy for hematochezia 9 mo after initial colonoscopy detected a large advanced cancer 30 mm in size at the cecum bottom. Histopathological examination of the surgically resected specimen revealed well differentiated adenocarcinoma invading the subserosa and no lymph node metastasis.