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Table 1 Michels' classification of hepatic artery variations

From: A rare case with multiple arterial variations of the liver complicated laparoscopic pancreaticoduodenectomy

Type

Description

Percent

I

Classic anatomy

55

II

rLHA arising from LGA

10

III

rRHA arising from SMA

11

IV

Coexistence of Type II and III

1

V

aLHA arising from LGA

8

VI

aRHA arising from SMA

7

VII

Coexistence of Type V and VI

1

VIII

rRHA from SMA + aLHA from LGA or aRHA from SMA + rLHA from LGA

2

IX

CHA arising from SMA

2.5

X

CHA arising from the LGA

0.5

  1. LHA left hepatic artery, RHA right hepatic artery, aLHA accessory left hepatic artery, aRHA accessory right hepatic artery, rLHA replaced left hepatic artery, rRHA replaced right hepatic artery, SMA superior mesenteric artery, CHA common hepatic artery, LGA left gastric artery