• Yozo Sato, Shigeru Matsushima, Yoshitaka Inaba, Tsuyoshi Sano, Hidekazu Yamaura, Mina Kato, Yasuhiro Shimizu, Yoshiki Senda, and Tsuneo Ishiguchi.
• Department of Radiology, Aichi Medical University, Aichi 480-1195, Japan. ; Department of Diagnostic and Interventional Radiology, Aichi Cancer Center Hospital, Nagoya 464-8681, Japan.
• Korean J Radiol. 2015 May 1; 16 (3): 523-30.

ObjectiveTo retrospectively evaluate relative enhancement (RE) in the hepatobiliary phase of gadoxetic acid disodium-enhanced magnetic resonance (MR) imaging as a preoperative estimation of future remnant liver (FRL) function in a patients who underwent portal vein embolization (PVE).Materials And MethodsIn 53 patients, the correlation between the indocyanine green clearance (ICG-K) and RE imaging was analyzed before hepatectomy (first analysis). Twenty-three of the 53 patients underwent PVE followed by a repeat RE imaging and ICG test before an extended hepatectomy and their results were further analyzed (second analysis). Whole liver function and FRL function were calculated on the MR imaging as follows: RE x total liver volume (RE Index) and FRL-RE x FRL volume (Rem RE Index), respectively. Regarding clinical outcome, posthepatectomy liver failure (PHLF) was evaluated in patients undergoing PVE.ResultsIndocyanine green clearance correlated with the RE Index (r = 0.365, p = 0.007), and ICG-K of FRL (ICG-Krem) strongly correlated with the Rem RE Index (r = 0.738, p < 0.001) in the first analysis. Both the ICG-Krem and the Rem RE Index were significantly correlated after PVE (r = 0.508, p = 0.013) at the second analysis. The rate of improvement of the Rem RE Index from before PVE to after PVE was significantly higher than that of ICG-Krem (p = 0.014). Patients with PHLF had a significantly lower Rem RE Index than patients without PHLF (p = 0.023).ConclusionRelative enhancement imaging can be used to estimate FRL function after PVE.

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