Hepatic arterial variants according to Michels

type Ⅰ Conventional anatomy: proper HA arising from common HA and then giving rise to right and left HAs as the sole supply of arterial blood to liver


type Ⅱ Replaced left HA arising from LGA


type Ⅲ Replaced right HA arising from SMA


type Ⅳ Both replaced left and right HAs as described for types Ⅱ and Ⅲ


type Ⅴ Accessory left HA arising from LGA


type Ⅵ Accessory right HA arising from SMA


type Ⅶ Accessory right HA arising from SMA and accessory left HA arising from left gastric artery


type Ⅷ Replaced right HA and accessory left HA or replaced left HA and accessory right HA


type Ⅸ Entire hepatic trunk arising from SMA


type Ⅹ Entire hepatic trunk arising from LGA