SORIN DUMITRU IOANOVICIU, CODRUT IVAN, PETRU MATUSZ, SORIN OLARIU, DANIEL LIGHEZAN MORPHOLOGICAL VARIABILITY OF THE HEPATIC PORTAL VEIN MEDIAL BRANCHES STUDY ON CORROSION CASTS The hepatic portal vein (HPV) is the central element of liver afferent pedicle. The intraparenchymal distribution of HPV determines the liver segmentation. The medial branches (MBs) serving left medial division (LMD) of the liver present the greatest morphological variability. On a total of 125 pieces of liver corrosion casts, one examined the intraparenchymal distribution of portal MBs and the segmentation of LMD. Regarding the intraparenchymal distribution of the branches in the LMD of the liver, we showed three distinct morphological types: Type I (81.6% of cases) where are present several small MBs with oblique downward trajectory; Type II (15.2% of cases) that has two distinct MBs, originating in the distal part of the PHV left branch, with slightly upward trajectory; Type III (3.2% of cases) that has three MBs, originating in the distal part of the PHV left branch, the higher with upward trajectory, the lower with downward trajectory, and the middle branch with variable trajectory and originated from the PHV left branch or in one of the first two MBs. Knowledge of this morphological types of portal MBs is important for clinical and surgical practice.