Narrow band imaging and white light endoscopy in the characterization of a polypectomy scar: A single-blind observational study

Figure 4 Examples of endoscopic mucosal scar with white light endoscopy and narrow band imaging (above and below and from left to right). A: Normal scar; B: Clear residual tissue of a surprisingly sessile serrated polyp/adenoma with no dysplasia on either the scar or endoscopic piecemeal mucosal resection; C: Apparent normal tissue with low-grade dysplasia at histology; D: Small residual tissue with low-grade dysplasia surrounding a clip (a clip artifact).