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Anterior basal vein of left lung

The anterior basal vein of the left lung (V8) is the segmental venous drain of the anterior basal segment (S8) of the left lower lobe. It typically arises from venules in S8, then courses anteriorly and medially toward the hilum, joining the basal venous trunk along with the lateral (V9), posterior (V10), and sometimes medial basal tributaries. This trunk empties into the left inferior pulmonary vein (LIPV) before entering the left atrium.

The anterior basal vein is important in segmental pulmonary resections, pulmonary venous mapping for atrial fibrillation ablation, and in the interpretation of pulmonary venous anatomical variations. Variants may include separate drainage into the LIPV or formation of common trunks with adjacent basal veins.

Synonyms

  • V8 vein (left lung)

  • Left anterior basal segment vein

  • Segment VIII pulmonary vein (left lower lobe)

Function

  • Drains oxygenated blood from the anterior basal segment (S8) of the left lower lobe

  • Contributes to the basal venous trunk → left inferior pulmonary vein → left atrium

  • Plays a role in surgical and electrophysiological procedures requiring precise venous anatomy

Tributaries

  • Intrapulmonary venules from subsegments of S8 coalesce to form the anterior basal vein (V8)

MRI Appearance

T1-weighted images:

  • Appears as a linear signal void (black lumen) along the basal segment course toward the hilum

T2-weighted images (normal):

  • Demonstrated as a dark flow void against hyperintense lung parenchyma and mediastinal fat

  • Intraluminal thrombus may show intermediate or high signal depending on clot stage

T2 TRUFISP (cardiac/respiratory-gated):

  • V8 visualized as a bright, continuous venous channel converging into the basal venous trunk and LIPV

  • Cine capability highlights drainage dynamics and patency

STIR:

  • Fat suppression enhances vein conspicuity against perihilar fat planes

  • Hyperintense perivascular tissue indicates edema, inflammation, or tumor infiltration

T1 Post-Contrast (Gadolinium-enhanced MRI):

  • V8 enhances brightly and homogeneously with contrast

  • Filling defects identify thrombosis, stenosis, or surgical ligation

MRI Non-Contrast Cardiac-Gated 3D (Whole-heart):

  • Provides detailed 3D visualization of V8, basal venous trunk, and LIPV connection

  • Useful in pre-ablation pulmonary venous mapping and segmentectomy planning

  • Helpful in patients with contraindications to contrast

CT Appearance

CT Coronary Angiography (CCTA) / CT Pulmonary Venography:

  • Contrast opacifies V8, its tributaries, and junction with the basal venous trunk and LIPV

  • Multiplanar and 3D reconstructions show precise venous anatomy, common trunks, and ostial variants

  • Critical for thoracic surgery, AF ablation, and evaluation of pulmonary venous anomalies

  • Differentiates venous structures from hilar masses or lymphadenopathy

CT image

Anterior basal vein of left lung anatomy CT axial image -img-00000-00000

MRI image

Anterior basal vein of left lung MRI IMAGE