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Topic

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Openings of pulmonary veins

The openings of the pulmonary veins are the venous orifices where the pulmonary veins drain oxygenated blood from the lungs into the left atrium. Typically, there are four pulmonary veins — right superior, right inferior, left superior, and left inferior — each entering the posterior wall of the left atrium through distinct oval-shaped ostia.

Anatomical variations are common: accessory veins, common ostia (especially on the left), or supernumerary veins are frequently observed. These openings are clinically significant in atrial fibrillation (AF), as the myocardial sleeves extending into the pulmonary veins often serve as arrhythmogenic foci. Pulmonary vein isolation (PVI) during AF ablation targets these ostial regions.

Synonyms

  • Pulmonary venous ostia

  • Pulmonary vein orifices

  • Ostia venarum pulmonalium

Function

  • Allow oxygenated blood from the lungs to flow into the left atrium

  • Maintain low-resistance venous return to facilitate efficient cardiac filling

  • Serve as anatomical landmarks for electrophysiology and ablation procedures

  • Play a critical role in the pathophysiology of atrial fibrillation

MRI Appearance

T1-weighted images:

  • Pulmonary vein openings appear as signal voids (black lumens) at the posterior wall of the left atrium

  • Endocardial border seen as a thin hypointense rim

T2 Cine (Cardiac-gated):

  • Cine imaging shows dynamic inflow of blood through the pulmonary vein ostia into the left atrium

  • Demonstrates flow patterns, atrial filling, and wall motion

T1 Post-Contrast (Gadolinium-enhanced MRI):

  • Enhances the pulmonary veins and their ostia brightly

  • Allows delineation of venous anatomy, variations, and thrombus detection

  • Critical for pre-ablation mapping in atrial fibrillation

MRI Non-Contrast Cardiac-Gated 3D Coronary Imaging:

  • High-resolution, ECG-gated, respiratory-navigated 3D imaging depicts pulmonary veins and ostia without contrast

  • Useful in patients with renal impairment or contrast contraindication

  • Provides accurate anatomical mapping for ablation procedures

MRA (Magnetic Resonance Angiography):

  • Contrast-enhanced MRA clearly shows ostia, pulmonary vein anatomy, and variants

  • Helpful in pre-procedural planning for AF ablation and surgical interventions

CT Appearance

CT Coronary Angiography (CCTA):

  • Gold-standard for non-invasive imaging of pulmonary vein openings

  • Shows number, size, shape, and orientation of ostia entering the left atrium

  • Detects anatomical variations (common ostium, accessory veins, supernumerary veins)

  • Essential for planning pulmonary vein isolation in atrial fibrillation ablation

  • 3D volume-rendered reconstructions provide detailed anatomical maps

CT images

Openings of pulmonary veins CT axial image -img-00000-00000

CT images

Openings of pulmonary veins CT axial image -img-00000-00000_00001

MRI image

Openings of pulmonary veins mri