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Superficial cerebral veins

The superficial cerebral veins (also known as cortical veins) are a network of veins located on the surface of the cerebral hemispheres. They play a crucial role in draining deoxygenated blood from the cortex and superficial white matter of the brain into the dural venous sinuses, primarily the superior sagittal sinus and transverse sinus. Their appearance and characteristics on imaging studies, such as MRI and CT, are essential in the diagnosis of various neurological and vascular conditions.

Synonyms

  • Cortical veins

  • Superficial cortical veins

  • Cerebral surface veins

  • Superficial cerebral venous system

Function

  • Drain deoxygenated blood from the outer layers (cortex and superficial white matter) of the brain

  • Direct blood flow toward the major dural venous sinuses (mainly superior sagittal sinus, transverse sinus, and cavernous sinus)

  • Maintain cerebral circulation and help regulate intracranial pressure

MRI Appearance

  • T2-Weighted Imaging

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

    • Seen as dark, serpiginous (snake-like) structures on the brain surface

  • T1-Weighted Imaging

    • Also appear as flow voids (low signal intensity)

    • Veins are dark against the brighter brain parenchyma

    • No intrinsic enhancement unless thrombosed or pathology present

  • 3D Phase Contrast (PC 3D) MRI

    • Enhances visualization of flowing blood within veins

    • Veins appear as bright, well-defined tubular structures

    • Useful for mapping venous anatomy and detecting abnormalities

  • Post-Contrast T1-Weighted Imaging

    • Superficial veins enhance and become more conspicuous

    • Appear as linear or curvilinear enhancing structures along the brain surface

    • Helpful in identifying venous thrombosis (lack of enhancement in affected vein)

CT Appearance

  • Non-Contrast CT

    • Superficial veins are not well visualized; may appear as faint, linear hypoattenuating (dark) structures

    • Hyperdense veins can indicate acute thrombosis (dense vein sign)

  • CT Venography (CTV)

    • Veins are clearly visualized as linear or curvilinear enhancing structures following intravenous contrast

    • Excellent for detecting patency or occlusion of cortical veins

    • Can show absence of opacification in cases of venous thrombosis

MRI images

Superficial cerebral veins sagittal mri 3t image