LAUSR

Purpose To investigate whether sarcopenia and myosteatosis correlate with the degree of hypertrophy (DH) and kinetic growth rate (KiGR) of the future liver remnant (FLR) in patients with colorectal liver metastases undergoing portal vein embolization (PVE) in preparation for right hepatectomy. Materials and Methods Forty-two patients were included. Total liver volume and FLR volume were measured before and 2–4 weeks after PVE. KiGR of the FLR was calculated. Sarcopenia was assessed using the total psoas muscle volume (PMV), the psoas muscle cross-sectional area (PMCS) and the total skeletal muscle index (L3SMI) at the level of 3rd lumbar vertebra. Degree of myosteatosis was assessed by mean muscle attenuation at L3 (L3MA). Correlations between muscle indices and DH and KiGR were assessed using simple linear regression analyses. Results Mean DH was 8.9 ± 5.7%, and mean KiGR was 3.6 ± 2.3. Mean PMV was 55.56 ± 14.19 cm 3 /m 3 , mean PMCS was 8.76 ± 2.3 cm 2 /m 2 , mean L3SMI was 45.6 ± 9.89 cm 2 /m 2 , and mean L3MA was 27.9 ± 18.6 HU. There was a strong positive correlation between PMV and DH ( R  = 0.503, p  = 0.001) and PMV and KiGR ( R  = 0.545, p  < 0.001). Furthermore, there was a moderate correlation between PMCS and KiGR ( R  = 0.389, p  = 0.014). L3SMI and L3MA were neither associated with DH ( p  = 0.390 and p  = 0.768, respectively) nor with KiGR ( p  = 0.188 and p  = 0.929, respectively). Conclusion We identified a positive correlation between PMV and PMCS, as markers for sarcopenia, and the KiGR of the FLR after PVE. PMV and PMCS might therefore aid to identify patients who are poor candidates for FLR augmentation using PVE alone.