FIGURE 2.

Measurement of the psoas muscle area (PMA) at the time of diagnosis and just before surgery. The bilateral psoas muscle cross‐sectional computed tomography images at the middle‐level of the third lumbar vertebra was measured using SYNAPSE VINCENT software. The border of the bilateral psoas muscle was manually outlined and quantified using Hounsfield unit thresholds (−29 to +150). The PMA just before surgery was divided by that at the time of diagnosis, and it was defined as the rate of change of PMA (CPMA)