Topics

Topic

design image
Portal vein branch to liver segment VII

The portal vein branch to liver segment VII is the segmental branch of the right posterior portal vein, which arises from the right portal vein (a major division of the main portal vein). According to Couinaud’s classification, liver segment VII is located in the posterior superior portion of the right lobe, adjacent to the diaphragm and inferior vena cava (IVC).

This branch typically runs superiorly and posteriorly from the right posterior portal trunk, supplying venous blood rich in nutrients from the gastrointestinal tract to segment VII hepatocytes. It courses in close relation to the segmental biliary ducts and hepatic arteries, forming the classic portal triad.

Clinically, knowledge of the portal vein branch to segment VII is crucial in hepatic surgery (segmentectomy, right posterior sectionectomy), liver transplantation, portal vein embolization, and interventional radiology procedures. Anatomical variations are common, and failure to identify this branch can result in incomplete resection or segmental ischemia.

Synonyms

  • Segment VII portal branch

  • Right posterior superior segmental portal vein

  • PV branch to hepatic segment VII

Function

  • Supplies nutrient-rich venous blood from the gastrointestinal system to segment VII of the liver

  • Works in conjunction with the hepatic artery branch to segment VII for dual blood supply

  • Plays a vital role in segmental liver function, regeneration, and surgical planning

MRI Appearance

T1-weighted images:

  • Portal vein branch appears as a dark flow void within liver parenchyma

  • Surrounded by intermediate signal intensity of hepatic tissue

T2-weighted images:

  • Lumen appears as a signal void

  • Surrounding parenchymal edema or congestion (in pathology) may appear hyperintense

STIR:

  • Fat suppression increases visibility of the vessel course

  • Highlights associated parenchymal edema in segment VII pathology

T1 Fat-Saturated (Pre-contrast):

  • Lumen shows intermediate signal intensity against suppressed hepatic fat, improving delineation of vascular structures

T1 Fat-Saturated Post-Contrast (Gadolinium):

  • Enhances brightly during the portal venous phase

  • Outlines the segment VII portal supply and confirms segmental vascularization

MRV (Magnetic Resonance Venography):

  • Provides non-invasive mapping of portal venous anatomy and variants

  • Demonstrates the origin from the right posterior portal vein, course, and distribution into segment VII

  • Critical in transplant donor evaluation, surgical planning, and embolization procedures

CT Appearance

CT Pre-Contrast:

  • Appears as a small tubular soft-tissue density within segment VII parenchyma

  • Difficult to separate from surrounding tissue without contrast

CT Post-Contrast:

  • Enhances during the portal venous phase, highlighting the segmental supply to VII

  • Useful for evaluating perfusion defects, thrombosis, or segmental lesions

CTV (CT Venography):

  • Provides detailed 3D reconstructions of the portal venous system

  • Clearly demonstrates segment VII portal branch origin, branching pattern, and intrahepatic distribution

  • Essential in living donor transplantation, resection planning, and vascular interventions

CT images

Portal vein branch to liver segment VII CT axial image 0

CT images

Portal vein branch to liver segment VII CT axial image 1

CT images

Portal vein branch to liver segment VII CT axial image 2