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Right branch of portal vein

The right branch of the portal vein (right portal vein) is the major intrahepatic division supplying the right lobe of the liver. It arises from the main portal vein bifurcation, coursing laterally into the liver parenchyma before dividing into anterior and posterior segmental branches. These branches deliver nutrient-rich portal blood to hepatic segments V, VI, VII, and VIII, playing a critical role in metabolic processing and hepatic function.

The right portal vein travels within the portal triad alongside a branch of the hepatic artery and an intrahepatic bile duct. Its course and branching pattern are essential landmarks in liver surgery, tumor resection, transplantation, and interventional radiology.

Synonyms

  • Right portal branch

  • Right intrahepatic portal vein

  • Ramus dexter venae portae

Location and Structure

  • Origin: Arises from the main portal vein within the porta hepatis.

  • Course: Runs laterally and posteriorly within the right hepatic lobe.

  • Divisions:

    • Anterior branch: Supplies segments V and VIII

    • Posterior branch: Supplies segments VI and VII

  • Walls: Thin-walled, low-pressure venous structure enclosed within Glisson’s sheath.

  • Accompanying structures: Right hepatic artery branch and right hepatic duct branch.

Relations

  • Anteriorly: Right hepatic duct, hepatic parenchyma

  • Posteriorly: Right hepatic vein lies more cranially and posteriorly

  • Superiorly: Segment VIII and diaphragm

  • Inferiorly: Segment V and gallbladder fossa

  • Medially: Main portal vein bifurcation

  • Laterally: Peripheral branches leading to segmental and subsegmental portal radicles

Function

  • Supplies nutrient-rich portal blood to right hepatic lobe

  • Distributes flow to segments V–VIII based on functional anatomy

  • Supports metabolic activities including detoxification, nutrient processing, and bile production

  • Serves as an important anatomical guide for hepatic resection planes and interventional access

MRI Appearance

MRV TOF (Time-of-Flight MR Venography):

  • Appears as a bright, high-signal vascular structure due to inflowing blood

  • Clearly demonstrates the main portal vein bifurcation and right portal branching pattern

  • Provides non-contrast visualization of stenosis, anatomical variants, or flow asymmetry

  • Background liver parenchyma suppresses, improving vessel contrast

T1 Fat-Saturated GRE:

  • Lumen shows intermediate-to-low signal depending on flow velocity

  • Fat-saturated background increases contrast between vessel lumen and surrounding liver

  • Vessel walls are thin and usually indistinguishable

  • Branching into anterior and posterior segments visible as linear dark channels

T2-weighted images:

  • Right branch appears as a dark flow void due to rapid blood flow

  • Surrounding hepatic parenchyma shows higher T2 signal than the vessel lumen

  • Clear delineation of portal triads when bile ducts appear slightly hyperintense

  • Useful for identifying anatomical course; no intrinsic enhancement

Post-Contrast T1 Fat-Saturated GRE:

  • Portal vein enhances brightly and uniformly in the portal venous phase

  • Right branch becomes well defined as a bright tubular structure branching into segments V–VIII

  • Enhances earlier than hepatic veins and persists through delayed phases

  • Glisson’s sheath appears slightly hyperintense due to surrounding vascular and connective tissue enhancement

CT Appearance

Post-Contrast CT (Portal Venous Phase):

  • Right portal vein branch fills with dense homogeneous contrast, appearing as a bright tubular structure

  • Branching pattern into anterior (V/VIII) and posterior (VI/VII) divisions clearly identified

  • Portal venous phase gives optimal contrast relative to hepatic parenchyma

  • Thin walls and surrounding Glisson’s sheath create subtle soft-tissue attenuation

  • Excellent delineation for surgical planning, variant anatomy, and pre-procedure mapping

MRI images

Right branch of portal vein MRI axial