On the first case, in the inland literature of regulated resection based on the (supra) hepatic segmentation, the authors are widely discussing the anatomical and surgical aspects regarding the distribution in two vertical territories of the right anterior (paramedian) sector (SAD), also by the (supra) hepatic and by the portal (Hjortsjo) segmentation. In comparison with the classic, portal (Couinaud-Bismuth) segmentation, in certain fortunate situations, the vertical distribution (instead of the transversal one) of the SAD helps to preserve more hepatic parenchyma, which is such necessary for the cirrhotic or metastatic liver.