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Inferior cerebellar veins

The inferior cerebellar veins are a network of small veins located on the inferior surface of the cerebellum, draining blood from the cerebellar hemispheres, vermis, and flocculonodular lobe. These veins course along the cerebellar sulci and fissures, ultimately emptying into the transverse, sigmoid, and inferior petrosal sinuses. They play a critical role in cerebellar venous drainage, maintaining proper venous outflow and intracranial pressure regulation.

The inferior cerebellar veins are divided into superficial and deep groups. The superficial veins drain the cortical cerebellar surfaces, whereas the deep veins collect blood from the cerebellar white matter and central nuclei. Their anatomical course is clinically significant in posterior fossa surgeries, venous infarction risk, and cerebellar hemorrhage evaluation.

Function

  • Drain venous blood from the inferior cerebellar surfaces

  • Maintain cerebellar venous outflow and intracranial pressure

  • Facilitate venous return to dural sinuses

  • Play a role in posterior fossa hemodynamics and cerebellar circulation

Synonyms

  • Inferior cerebellar veins of the posterior fossa

  • Cerebellar inferior veins

  • Posteroinferior cerebellar veins

MRI Appearance

T1-weighted images:

  • Inferior cerebellar veins appear as linear or tubular low signal intensity (hypointense) structures along the inferior cerebellar surface

  • Surrounded by hyperintense CSF in the subarachnoid space, providing natural contrast

  • Flow-related signal voids may be seen in larger veins

T2-weighted images:

  • Veins are low signal (hypointense) due to flowing blood

  • CSF remains high signal, outlining the veins

  • Useful for assessing venous anatomy and detecting thrombosis

STIR (Short Tau Inversion Recovery):

  • Veins remain low signal

  • STIR may highlight adjacent edema or cerebellar pathology in cases of venous congestion or infarction

T1 Post-Contrast (Gadolinium-enhanced):

  • Inferior cerebellar veins demonstrate linear or tubular enhancement, following the course of venous flow

  • Helps identify venous patency, thrombosis, or abnormal venous connections

CT Appearance:

  • On non-contrast CT, veins are usually not directly visualized unless thrombosed or calcified

  • On contrast-enhanced CT (CT venography), veins appear as enhancing tubular structures along the inferior cerebellar surface

  • CT is particularly useful in detecting cerebellar venous thrombosis, hemorrhage, or vascular malformations

MRI images

Inferior cerebellar veins mri sag image -img-00000-00000