Can White Light Endoscopy or Narrow Band Imaging preclude routine biopsy of colorectal endoscopic mucosal resection scars? A multicentre randomized single-blinded crossover trial.

The accuracy of NBI for the diagnosis of recurrence was not superior to that of WLE. Endoscopic assessment of EMR scars with WLE and NBI achieved a NPV that precludes routine biopsy in cases of negative optical diagnosis.