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Internal cerebral vein

The internal cerebral veins are paired deep midline venous structures in the brain that play a vital role in draining blood from the deep white matter and adjacent structures. They run posteriorly above the thalami, joining at the vein of Galen (great cerebral vein). Their assessment is crucial in neuroimaging for evaluating deep venous thrombosis, vascular malformations, and pathologies affecting the deep brain. Understanding their normal and abnormal imaging appearances on CT and MRI is essential for radiologists and clinicians.

Synonyms

  • Venae cerebri internae (Latin)

  • Deep cerebral veins

Function

  • Drain venous blood from deep brain structures, including:

    • Thalamus

    • Caudate nucleus

    • Internal capsule

    • Choroid plexus of the lateral and third ventricles

  • Merge posteriorly to form the vein of Galen (great cerebral vein)

  • Essential in maintaining deep cerebral venous outflow

MRI Appearance

  • T1-weighted (T1):

    • Normally appear as flow voids (signal loss) due to rapid blood flow

    • Thin, linear, low-signal structures above the thalami and third ventricle

  • T2-weighted (T2):

    • Appear as flow voids (dark linear structures) similar to T1

    • Easily identified above the thalami, medial to the lateral ventricles

  • Phase-Contrast 3D (PC 3D):

    • PC-MRI sequences (3D venography) provide high-contrast visualization

    • Internal cerebral veins are highlighted as bright vascular channels

    • Useful for assessing patency, caliber, and flow direction

  • Post-Contrast T1 (Gadolinium-enhanced):

    • Veins enhance and become hyperintense (bright) on T1 images

    • Enhancement highlights venous anatomy and can help detect thrombosis or filling defects

CT Appearance

  • Non-contrast CT:

    • Internal cerebral veins are typically not directly visualized unless thrombosed

    • May see indirect signs (hyperdensity if thrombosed, local edema)

    • Normally, the region appears as linear hypodensities (due to flow)

  • CT Venography (CTV):

    • Provides direct visualization after contrast administration

    • Internal cerebral veins appear as opacified (hyperdense) linear structures above the thalami

    • Useful in detecting filling defects (thrombosis), stenosis, or anatomical variants

MRI images

Internal cerebral veins MRI 3T axial image

MRI images

Internal cerebral veins MRI 3T mip image

MRI images

Internal cerebral veins MRI 3T PC 3D image

MRI images

Internal cerebral veins MRI 3T sagittal image