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Topic

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Left inferior pulmonary vein

The left inferior pulmonary vein (LIPV) is one of the four major pulmonary veins responsible for returning oxygenated blood from the left lung to the left atrium. It drains blood from the left lower lobe and courses medially through the pulmonary hilum to reach the posterior wall of the left atrium.

Typically, the LIPV enters the left atrium as a single ostium, though variations such as separate superior and inferior segmental ostia or a common trunk with the left superior pulmonary vein can occur. The vein is clinically significant in atrial fibrillation (AF) because myocardial sleeves extend into the pulmonary veins, serving as triggers for ectopic electrical activity. It is frequently targeted during catheter ablation procedures.

Synonyms

  • LIPV

  • Left lower pulmonary vein

  • Vena pulmonalis sinistra inferior

Function

  • Returns oxygenated blood from the left lower lobe of the lung to the left atrium

  • Contributes to systemic arterial circulation via the left atrium and left ventricle

  • Plays a role in atrial fibrillation pathophysiology due to myocardial sleeve extensions

  • Serves as an anatomical landmark in pulmonary vein isolation procedures

Tributaries

  • Segmental veins from the superior, basal, and posterior segments of the left lower lobe

  • Unite to form the common LIPV trunk before entering the left atrium

MRI Appearance

T1-weighted images:

  • LIPV appears as a tubular signal void (black lumen) as blood flow is too rapid for signal capture

  • Surrounded by hyperintense mediastinal fat, aiding identification

T2-weighted images:

  • Lumen appears as a signal void

  • Thrombosis (rare) may appear as intermediate-to-high signal within the vein

T2 TRUFISP (cardiac-gated):

  • Demonstrates the LIPV as a bright, well-defined vascular lumen

  • Provides dynamic cine imaging, showing venous inflow into the left atrium

  • Excellent for evaluating anatomical variations and flow characteristics

STIR (Short Tau Inversion Recovery):

  • Fat suppression increases contrast against surrounding mediastinal fat

  • Useful for detecting perivenous inflammation or edema

T1 Post-Contrast (Gadolinium-enhanced MRI):

  • LIPV enhances brightly and homogeneously

  • Filling defects may indicate thrombus, tumor extension, or stenosis

  • Essential for MR angiography in atrial fibrillation mapping

MRI Non-Contrast 3D Cardiac-Gated Imaging:

  • Depicts the course, size, and ostial anatomy of the LIPV without contrast

  • Clearly demonstrates relationship to left atrium and adjacent pulmonary veins

  • Important for pre-ablation planning and anatomical mapping in patients with renal impairment

MRA (Magnetic Resonance Angiography):

  • Contrast-enhanced MRA shows detailed pulmonary venous anatomy and ostial diameters

  • Useful in atrial fibrillation evaluation, pulmonary venous stenosis, or anomalies

CT Appearance

CT Coronary Angiography (CCTA):

  • Best non-invasive modality for pulmonary venous anatomy

  • LIPV opacifies brightly with contrast, showing its drainage into the left atrium

  • Identifies ostial size, number, and variations (separate segmental ostia, common trunks, accessory veins)

  • Essential for pre-ablation mapping, post-ablation stenosis detection, and congenital venous anomaly assessment

  • Multiplanar and 3D reconstructions provide high-resolution views for interventional planning

CT image

Left inferior pulmonary vein anatomy CT axial image -img-00000-00000

MRI images

Left inferior pulmonary vein anatomy MRI coronal image -img-00000-00000

MRI images

Left inferior pulmonary vein mri image