Clinical anatomy of hepatic vessels by computed tomography angiography: A minireview

Table 1 Michels’ classification of the hepatic arterial anatomy[16]

Type	Frequency (%)	Description
I	55.0	RHA, MHA, and LHA arise from common hepatic artery
II	10.0	RHA, MHA, and LHA arise from common hepatic artery; replaced LHA arises from left gastric artery
IV	1.0	Replaced RHA and LHA
V	8.0	RHA, MHA, and LHA arise from common hepatic artery; accessory LHA arises from left gastric artery
VI	7.0	RHA, MHA, and LHA arise from common hepatic artery; accessory RHA
VII	1.0	Accessory RHA and LHA
VIII	4.0	Replaced RHA and accessory LHA or replaced LHA and accessory RHA
IX	4.5	Entire hepatic trunk arises from superior mesenteric artery
X	0.5	Entire hepatic trunk arises from left gastric artery

RHA: Right hepatic artery; MHA: Middle hepatic artery; LHA: Left hepatic artery.