['To evaluate whether the congested area that develops in associating liver partition with portal vein ligation for staged hepatectomy (ALPPS) contributes to rapid future liver remnant (FLR) hypertrophy.', 'Eight patients undergoing liver partition and right portal vein (RPV) ligation within the FLR in the first operation of ALPPS were compared with eight patients undergoing RPV embolization in the FLR as the first operation of classical two-stage (CTS) hepatectomy.', 'Extrapolated kinetic growth of the FLR in ALPPS was 32.7±18.7 ml/day, 7.8-times that in CTS (4.2±2.0 ml/day, p=0.001). Extrapolated kinetic reduction in volume of the ventral aspect of the right paramedian sector, which became congested after the first procedure in ALPPS, was 19.8±11.6 ml/day, 11-times that in CTS (1.8±1.3 ml/day, p=0.001).'] Does parenchymal Congestion be Important for Rapid Regeneration of the Future Liver Remnant Following the ALPPS Procedure?