Measuring polyp size using a virtual scale endoscope: a video tutorial with clinical case demonstration.

Abstract

Accurate real-time endoscopic assessment of colorectal polyp size plays a key role for selecting adequate post-polypectomy surveillance intervals or when choosing appropriate polypectomy techniques [1]. While visual estimation is the most commonly used method of measurement, there is marked interobserver variability. Biopsy forceps and ruler snares can be used as references for polyp size estimation, but are limited by being external devices that lengthen the duration of the endoscopy and increase the procedural cost [2] [3].