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Deep middle cerebral vein

The deep middle cerebral vein (DMCV), also called the deep sylvian vein, is a prominent vein that courses within the Sylvian (lateral) fissure, accompanying the M2 branches of the middle cerebral artery (MCA). It drains venous blood from the insula, opercular cortex, and adjacent deep white matter, eventually joining the basal vein of Rosenthal or sometimes connecting with the superior sagittal sinus via the superficial middle cerebral vein. The DMCV plays a critical role in the deep venous drainage of the lateral cerebral hemisphere, linking superficial and deep venous networks.

Synonyms

  • Deep sylvian vein

  • Deep middle cerebral vein (DMCV)

  • Internal sylvian vein

Function

  • Drains venous blood from the insula, operculum, and adjacent white matter

  • Provides a major venous outflow route from the Sylvian fissure

  • Connects superficial and deep venous systems, contributing to venous collateral circulation

  • Joins the basal vein of Rosenthal, eventually draining into the vein of Galen and straight sinus

MRI Appearance

T1-weighted images (non-contrast):

  • Vein appears as a linear or curvilinear flow void (signal loss) within the Sylvian fissure

  • Surrounding parenchyma shows normal cortical and white matter signal

T2-weighted images:

  • DMCV also appears as a flow void, sharply delineated by hyperintense CSF in the Sylvian fissure

  • Pathology such as thrombosis may appear as loss of flow void with intermediate or hyperintense intraluminal signal

MRA / MRV (Magnetic Resonance Venography):

  • Time-of-flight (TOF) or contrast-enhanced MRV demonstrates the entire venous course within the Sylvian fissure

  • DMCV appears as a well-defined enhancing venous channel

  • MRV is ideal for evaluating venous thrombosis, stenosis, or collateral circulation

T1 Post-Contrast (Gadolinium-enhanced MRI):

  • Vein enhances strongly and homogeneously after contrast administration

  • Loss of expected enhancement may suggest occlusion or thrombosis

CT Appearance

Non-contrast CT:

  • Vein is not normally visible

  • Acute thrombosis may appear as a hyperdense linear structure in the Sylvian fissure

CT Venography (CTV):

  • Clearly shows the course and drainage pattern of the DMCV

  • Opacified vein appears as a well-defined enhancing tubular structure along the Sylvian fissure

  • Useful for diagnosing cerebral venous thrombosis, venous anomalies, or surgical planning

MRI images

Deep middle cerebral vein