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

Figure 4 Measurements of visceral fat area and subcutaneous fat area. A: Measurement of visceral fat area (c): Area of visceral fat at the level of the umbilicus; B: Measurement of subcutaneous fat area (d): Area of subcutaneous fat at the level of the umbilicus.