The systemic venous architecture of the liver comprises three main venous vessels which drain into the ICV: the right hepatic vein, the middle hepatic vein and the left hepatic vein. In about 60% of individuals, the left hepatic vein and the middle hepatic vein form a common trunk which drains separately into the ICV. Normally, the right hepatic vein drains liver segments V-VII, the middle hepatic vein drains segments IV, V and VIII, and the left hepatic vein drains segments II and III. Venous drainage from segment I usually occurs directly into the ICV. This is considered the cause of hypertrophy of this segment in cirrhotic livers as result of an improved blood supply [13,31].
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