Introduction : Variations in the regression and origin of hepatic arteries lead to formation of aberrant variants of the hepatic artery. Knowledge of these arterial variations is of importance for upper abdominal surgery and interventional procedures. Michel’s classification of hepatic artery based on its origin is ambiguous and surgeons misinterpret that accessory artery can be sacrificed; it does not signify the arterial distribution within the liver. Wang et al. 2010 proposed hepatic artery classification based on the distribution of middle hepatic artery, however a proportion of variants were unclassified. We have studied the incidence of hepatic artery variations with MDCT and propose a modified Michel’s classification based on Brisbane terminology of liver anatomy

Methods : Hepatic Artery variation was analyzed in patients undergoing MDCT abdomen from September 2017 to till date. Origin, course and branching pattern of the common hepatic artery was documented with axial images and vascular reconstruction done in needed cases.

Results : Multi-detector CT of 300 patients was studied. Based on our analysis, we have modified Michel’s classification with Brisbane terminology of liver anatomy into six types- I – Normal variant (67.3%), II – Replaced Segmental/Sectional hepatic artery [ LL(13.5%); RP (0.8%)], III – Replaced hepatic artery [Left (2.9%); Right (15.1%)], IV – Double Replaced pattern, V - Replaced common hepatic artery (0.4%) and VI – others.

Conclusions : As compared to existing classification our modified Michel’s classification, signifies both origin and branching pattern of hepatic artery, comprehensively including most variants. As surgical implication, this enables minimization of biliary complications with preservation of arterial distribution