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

Figure 4 An early “missed or new” post-colonoscopy colorectal cancer case (No. 3 in Table 2). An 82-year-old man underwent initial colonoscopy and was found to have no adenomatous polyps. A: Subsequent colonoscopy 17 mo later revealed a large flat lesion, a laterally spreading non-granular-type tumor (LST-NG), measuring 25 mm in the transverse colon; B: Chromoendoscopy with crystal violet shows a type-Vi pit with a non-invasive pattern suggesting high-grade adenoma or submucosal shallow invasive cancer; C: Histopathological examination of the ESD specimen reveals well differentiated adenocarcinoma with submucosal shallow (200 μm) invasion (arrow) and no lymphovascular involvement. ESD: Endoscopic submucosal dissection.