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Superior cortical veins

The superior cortical veins are a group of superficial veins that drain blood from the superolateral and medial surfaces of the cerebral hemispheres. They run across the cortical surface and empty into the superior sagittal sinus, the largest dural venous sinus. These veins follow the sulci and vary greatly in number, size, and position. They carry venous blood from the cerebral cortex and subcortical white matter.

The superior cortical veins are clinically significant because they can be affected by thrombosis, venous infarction, trauma, or surgical injury. Their close relationship to the superior sagittal sinus makes them important landmarks in neurosurgery and neuroimaging.

Synonyms

  • Superficial cortical veins

  • Veins of the cerebral convexity

  • Dorsal cortical veins

Function

  • Drain venous blood from the cerebral cortex and subcortical white matter of the superior hemispheres

  • Empty into the superior sagittal sinus

  • Maintain normal cortical venous outflow and intracranial circulation balance

  • Provide collateral venous pathways in case of sinus obstruction

MRI Appearance

T1-weighted images (non-contrast):

  • Veins appear as linear or serpiginous flow voids over the cortical surface

  • Not well visualized without contrast or venographic sequences

T2-weighted images:

  • Appear as flow voids (hypointense linear structures) following the sulci

  • Adjacent parenchymal edema or infarction may be seen if venous drainage is impaired

MRV (Magnetic Resonance Venography):

  • TOF MRV and contrast-enhanced MRV show veins as bright, enhancing linear channels draining into the superior sagittal sinus

  • Excellent for detecting thrombosis, hypoplasia, or abnormal venous anatomy

T1 Post-Contrast (Gadolinium-enhanced MRI):

  • Veins enhance strongly, improving delineation of venous drainage patterns

  • Useful in conjunction with MRV for identifying venous occlusion, collateral flow, or venous malformations

CT Appearance

Non-contrast CT:

  • Normal veins are usually not visualized

  • Acute cortical vein thrombosis may appear as a hyperdense cortical vein sign

CT Venography (CTV):

  • Shows veins as contrast-filled linear channels converging on the superior sagittal sinus

  • Excellent for diagnosing cortical vein thrombosis, stenosis, or collateral venous patterns

  • Can also show secondary changes such as venous infarction or hemorrhage

MRI images

Superior cortical veins mri axial image