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Anteromedian pontine vein

The Anteromedian Pontine Vein is a small but significant venous structure located along the anterior midline of the pons within the brainstem. It is responsible for draining blood from the medial portions of the pons and contributes to the deep venous drainage system of the brainstem. Due to its location and size, this vein is mainly identified on advanced neuroimaging and plays a role in differentiating normal anatomy from pathologies or vascular malformations.

Synonyms

  • Median anterior pontine vein

  • Vena pontis anteromediana (Latin)

  • Medial pontine vein

Function

  • Drains venous blood from the anterior and medial regions of the pons.

  • Empties primarily into the basal vein of Rosenthal or adjacent pontine veins.

  • Plays a role in maintaining proper venous outflow from the brainstem.

MRI Appearance

  • T2-weighted MRI:

    • Appears as a small, linear, or dot-like hypointense (dark) structure along the anterior midline of the pons.

    • Can sometimes be difficult to distinguish unless using high-resolution sequences.

  • T1-weighted MRI:

    • Generally seen as a hypointense (dark) structure.

    • Its visualization is often limited due to its small caliber and lack of intrinsic signal.

  • 3D Phase Contrast (PC 3D) MRI:

    • The anteromedian pontine vein can be highlighted as a flow void or as a linear structure, depending on the sequence parameters.

    • Useful for mapping venous anatomy, especially in planning for vascular or surgical procedures.

  • Post-Contrast T1-weighted MRI:

    • Shows linear or dot-like enhancement due to intravascular gadolinium.

    • Enhanced visibility allows better differentiation from adjacent parenchymal structures.

CT Appearance

  • Non-contrast CT:

    • Usually not visible due to its small size and lack of density difference from surrounding tissues.

    • May be seen as a faint linear or dot-like density in high-resolution thin-section scans.

  • CT Angiography (CTA):

    • Can be visualized as a small enhancing vein along the anterior midline of the pons.

    • Enhancement is best seen in the venous phase.

MRI images

Anteromedian pontine vein MRI 3T axial image