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Superficial middle cerebral vein

The superficial middle cerebral vein (SMCV), also known as the Sylvian vein or superficial Sylvian vein, is a prominent cerebral vein that runs along the lateral fissure (Sylvian fissure) of the brain. It is responsible for draining blood from the lateral surface of the cerebral hemisphere, particularly from the frontal, parietal, and temporal lobes, and empties into the cavernous sinus or sphenoparietal sinus. Understanding its anatomy and imaging characteristics is essential for interpreting neuroimaging and diagnosing vascular pathologies.

Synonyms

  • Superficial Sylvian vein

  • Superficial middle cerebral vein (SMCV)

  • Vena media cerebri superficialis (Latin)

  • Sylvian vein

Function

  • Drains blood from the lateral surface of the cerebral hemisphere, including the frontal, parietal, and temporal lobes.

  • Empties into the cavernous sinus, sphenoparietal sinus, or sometimes into the superior sagittal sinus.

  • Plays a crucial role in cerebral venous outflow.

MRI Appearance

  • T1-weighted images (T1WI):

    • Normally appears as a flow void (dark linear or serpiginous structure) due to rapid blood flow.

    • Not directly visible unless there is thrombosis, slow flow, or enhancement after contrast.

  • T2-weighted images (T2WI):

    • Also seen as a flow void (dark) structure in the Sylvian fissure.

    • Adjacent brain tissue shows normal signal intensity unless pathology is present.

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

    • Vein enhances vividly due to intravascular contrast, appearing as a bright serpiginous structure along the Sylvian fissure.

    • Useful for detecting thrombosis (lack of enhancement) or abnormal veins.

  • 3D Phase-Contrast (PC 3D) MRI:

    • Depicts the SMCV as a well-defined venous structure with high signal, allowing for clear visualization of its course and branching pattern.

    • Useful for assessing patency and anatomical variations.

CT Appearance

  • Non-contrast CT:

    • Vein itself is not directly visible unless calcified or thrombosed (may show as hyperdense line if thrombosed).

    • The Sylvian fissure may be seen, but the vein blends with adjacent brain tissue.

CT Venography (CTV) Appearance

  • SMCV is well-opacified and appears as a linear or serpiginous enhancing structure along the lateral (Sylvian) fissure.

  • Shows continuity with draining sinuses (cavernous or sphenoparietal sinus).

  • Useful for detecting thrombosis (filling defect) or anatomic variants.

MRI images

Superficial middle cerebral vein MRI 3T axial image

MRI images

Superficial middle cerebral vein MRI 3T coronal image