Narrow-band imaging for scar (NBI-SCAR) classification: from conception to multicenter validation

Background and AimsSurveillance post–endoscopic resection (ER) currently warrants biopsy samples from the resection site scar in most cases, although clinical practice is variable. A classification with standard criteria for scars has not yet been established. We aimed to create and validate a novel classification for post-ER scars by using specific criteria based on advanced imaging.MethodsKey endoscopic features for scars with and without...