Nomogram for predicting the feasibility of natural orifice specimen extraction after laparoscopic rectal resection

Background and Aim The goal of this study was to develop a preoperative nomogram for predicting the feasibility of trans‐anal natural orifice specimen extraction (NOSE) for rectal cancer. Methods The analysis included 201 patients who underwent trans‐anal NOSE and 457 patients who failed to undergo trans‐anal NOSE in Shanghai East Hospital. The data collected included age, gender, body mass index, presence of tumor obstruction, distance from anal verge; maximum tumor diameter and anteroposterior thickness of mesorectum (AP) measured by magnetic resonance imaging; interspinous diameter, intertuberous diameter (IT), anteroposterior diameter of the inlet (API), anteroposterior diameter of the midplane, anteroposterior diameter of the outlet (APO), sacral length and pelvic depth (PD) measured by computed tomography. Results The multivariate analysis suggested that a lower body mass index (P