Topics

Topic

design image
Vein of septum pellucidum

The vein of the septum pellucidum is a small but important intracranial vein located within the septum pellucidum—a thin, midline membranous structure separating the anterior horns of the lateral ventricles. This vein is part of the deep cerebral venous system, playing a role in draining blood from the septal region and adjacent areas. It typically courses posteriorly along the septum pellucidum and ultimately drains into the internal cerebral vein. Recognition of this vein is essential in neuroimaging, especially in the evaluation of septal or midline brain lesions and when assessing deep venous anatomy prior to neurosurgical intervention.

Synonyms

  • Vena septi pellucidi

  • Septal vein

  • Vein of the septum lucidum

Function

  • Drains venous blood from the septum pellucidum and adjacent medial aspects of the frontal horns of the lateral ventricles

  • Empties into the internal cerebral vein

  • Contributes to the deep cerebral venous drainage

MRI Appearance

  • T2-weighted MRI:

    • Appears as a small, thin linear flow void (signal loss) along the septum pellucidum, situated between the lateral ventricles

    • May be very subtle due to its small caliber and slow flow

  • T1-weighted MRI (pre-contrast):

    • Typically seen as a linear hypointense structure in the septal region

    • May not always be visualized unless enlarged or with high-resolution imaging

  • 3D Post-Contrast T1-weighted MRI (PC 3D):

    • Enhances as a thin linear or tubular structure following intravenous gadolinium

    • Seen more distinctly due to contrast filling, aiding in differentiation from non-vascular septal structures

CT and CTV Appearance

  • Non-contrast CT:

    • Usually not visualized due to its small size and low contrast with surrounding brain tissue

    • May be indirectly appreciated if enlarged or if there is adjacent pathology (e.g., septal hematoma)

  • CT Venography (CTV):

    • Can be seen as a faint, thin enhancing line within the septum pellucidum, best visualized on high-resolution multiplanar reconstructions

    • Most reliably seen on CTV in patients with deep venous anomalies or during pre-surgical planning

MRI images

Vein of septum pellucidum MRI 3T sagittal image