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. 2022 Feb 2;38(2):134–141. doi: 10.1007/s12055-021-01253-7

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Fig. 2 — Measurement of the psoas muscle area on preoperative CT. Cross-sectional areas (mm²) of the psoas muscle at the level of the inferior border of the fourth lumbar vertebra (L4) measured by manual tracing on CT scans