Correlation between sarcopenia and esophageal stenosis following endoscopic submucosal dissection and construction of a postoperative stenosis risk model

Figure 1 Assessment of body composition by computed tomography at the third lumbar vertebra (L3) level. A: Axial computed tomography (CT) image showing the segmentation of different tissue compartments: Skeletal muscle area (SMA) [pink, -29 to +150 Hounsfield units (HU)], visceral adipose tissue area (light blue, -150 to -50 HU), subcutaneous adipose tissue area (dark blue, -190 to -30 HU), and intermuscular adipose tissue area (orange, -190 to -30 HU); B: Sagittal CT image indicating the L3 level for axial analysis. The skeletal muscle index was calculated as the SMA divided by the square of the patient’s height (SMA/height²).