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Inferior vein of vermis

The inferior vein of vermis is a small but significant vein located on the inferior (lower) surface of the cerebellar vermis. It plays a crucial role in draining venous blood from the inferior aspects of the cerebellar vermis into the larger venous sinuses, particularly the straight sinus or the vein of Galen. Recognizing this vein on neuroimaging, especially MRI and CT/CTV, is important in the context of venous anatomy, planning for neurosurgical procedures, and identifying venous pathologies in the posterior fossa.

Synonyms

  • Inferior vermian vein

  • Vena vermis inferior (Latin)

  • Inferior vein of the cerebellar vermis

Function

  • Drains venous blood from the inferior (caudal) portion of the cerebellar vermis.

  • Empties into the straight sinus or, less commonly, the vein of Galen.

  • Plays a role in the venous outflow of the posterior fossa and may serve as an important landmark in neuroimaging and neurosurgery.

MRI Appearance

  • T2-weighted MRI:

    • Appears as a flow void (dark/black linear structure) on the inferior surface of the vermis due to rapid blood flow.

    • Clearly delineated against the bright signal of surrounding cerebellar tissue.

  • T1-weighted MRI:

    • Seen as a hypointense (dark) linear structure.

    • May be less conspicuous than on T2 but still visualized as a flow void.

  • 3D Phase Contrast (PC 3D) MRI:

    • Demonstrates the vein as a high-signal, tubular structure due to sensitivity to blood flow.

    • Useful for mapping small veins of the cerebellum and assessing venous anatomy in three dimensions.

  • Post-Contrast T1-weighted MRI:

    • The inferior vein of vermis enhances, appearing as a thin, linear, bright structure due to contrast opacification.

    • Enhances the delineation of venous anatomy, especially in cases of venous thrombosis or malformation.

CT & CTV Appearance

  • Non-contrast CT:

    • Usually not visualized due to its small size and lack of inherent contrast with surrounding tissues.

    • Rarely seen as a faint linear structure if calcified or with very thin slices.

  • CT Venography (CTV):

    • Visualized as a small, enhancing linear or tubular structure on the inferior aspect of the cerebellar vermis.

    • More conspicuous with high-resolution imaging and optimal contrast timing.

    • Important in evaluating venous anatomy prior to posterior fossa surgery or in suspected venous thrombosis.

MRI images

Inferior vein of vermis axial 3T image

MRI images

Inferior vein of vermis MRI 3T coronal image

MRI images

Inferior vein of vermis MRI 3Tsagittal image