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Computed tomography images of the third lumbar vertebra level, used to assess skeletal muscle mass. Subpanels (A) and (B) illustrate the findings of two male patients with gastric cancer who had identical body mass index (22 kg/m2). Red indicates skeletal muscle mass areas. Patient (A) of age 62 years had sarcopenia with skeletal muscle index (SMI) of 36.0 cm2/m2, whereas 72-year-old patient (B) had SMI of 53.3 cm2/m2.
