Endoscopic Measurement of Polyp Size Using a Novel Calibrated Hood

Figure 2

Three methods to measure polyp size using the calibrated hood. (1) “Frontal method”: the calibrated hood is placed directly over the top of the polyp, and the inner wall of the hood is brought into close contact with the side of the polyp. The diameter of the polyp is then calculated by envisioning horizontal lines extending from the hood’s calibrations. (2) “Mounted method”: the rim of the calibrated hood is placed over the diameter of the polyp. (3) “Side method” (sessile polyps only): the inner wall of the hood is brought into close contact with the diameter of the polyp base.