Construction of a nomogram model to predict technical difficulty in performing laparoscopic sphincter-preserving radical resection for rectal cancer

Figure 3 Measurements of rectal area and mesorectal fat area. A: Measurement of rectal area (a): Area of the rectum at the level of the ischial spine; B: Measurement of mesorectal fat area (b): Area of the mesorectal fat at the level of the ischial spine.