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Topic

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Precentral cerebellar vein

The precentral cerebellar vein is a prominent midline vein of the posterior fossa, draining the anterior aspect of the cerebellar vermis and adjacent cerebellar hemispheres. It plays a critical role in the venous drainage of the cerebellum and is an important structure seen in neuroimaging, particularly in MRI and CT venography studies. Recognition of this vein is essential for radiologists to differentiate normal anatomical structures from pathological lesions or vascular malformations.

Synonyms

  • Vena cerebelli precentralis (Latin)

  • Anterior vermian vein

  • Precentral vermian vein

  • Precentral vein of the cerebellum

Function

  • Drains blood from the anterior (precentral) region of the cerebellar vermis and adjacent superior cerebellar hemispheres

  • Empties into the great cerebral vein (vein of Galen) or directly into the straight sinus

  • Important in maintaining proper venous outflow from the cerebellum and preventing venous congestion

MRI Appearance

  • T1-weighted Images (T1WI):

    • Appears as a small, linear, or curvilinear hypointense structure in the midline anterior to the superior cerebellar vermis

    • May not be easily visualized unless there is increased flow or vessel engorgement

  • T2-weighted Images (T2WI):

    • Presents as a flow void (hypointense line) due to rapid blood flow within the vein

    • Well seen against the hyperintense cerebellar tissue, especially on higher resolution scans

  • Phase Contrast 3D (PC 3D) MR Venography:

    • Demonstrates as a thin, linear, enhancing vessel anterior to the cerebellar vermis

    • High sensitivity for visualizing normal venous anatomy and variants

    • Useful for mapping cerebellar venous drainage, particularly in pre-surgical planning

  • Post-Contrast T1-weighted Images (Gadolinium-enhanced T1):

    • Shows as a well-defined, enhancing linear structure

    • Enhancement due to the presence of intravascular contrast

    • May appear more conspicuous post-contrast, aiding in differentiation from non-vascular midline lesions

CT and CTV (CT Venography) Appearance

  • Non-contrast CT:

    • Typically not visible unless thrombosed or calcified

    • May appear as a faint linear hypodensity anterior to the cerebellar vermis in rare cases

  • Contrast-Enhanced CT/CTV:

    • Visualized as a small, linear, enhancing vessel at the midline, anterior to the superior vermis

    • Best appreciated on multi-planar or 3D reconstructions

    • Useful for assessing venous anomalies or thrombosis

MRI images

Precentral cerebellar vein MRI 3T axial image

MRI images

Precentral cerebellar vein MRI 3T sagittal image