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Anterior hippocampal veins

The anterior hippocampal veins are venous tributaries of the hippocampus located in the medial temporal lobe. They primarily drain the anterior portion of the hippocampus and parahippocampal gyrus, eventually emptying into the basal vein of Rosenthal. These veins are part of the deep cerebral venous system, contributing to drainage of the mesial temporal structures. They run along the hippocampal sulcus, coursing posteriorly to join larger venous collectors.

The anterior hippocampal veins are clinically relevant in temporal lobe epilepsy surgery, hippocampal sclerosis, and vascular malformations, where precise knowledge of venous anatomy is essential to avoid complications.

Synonyms

  • Hippocampal tributary veins (anterior group)

  • Temporal lobe hippocampal veins

  • Venous tributaries of the basal vein (anterior hippocampal)

Function

  • Drain venous blood from the anterior hippocampus and parahippocampal gyrus

  • Connect with the basal vein of Rosenthal for deep cerebral venous return

  • Maintain venous outflow from mesial temporal structures

  • Provide collateral venous pathways within the deep cerebral venous system

MRI Appearance

T1-weighted images (non-contrast):

  • Veins appear as signal voids (dark linear structures) along the medial temporal lobe, due to flowing blood

  • Small size makes them challenging to visualize without venographic techniques

T2-weighted images:

  • Similarly appear as flow voids against the hyperintense surrounding CSF in the temporal horn of the lateral ventricle

  • Adjacent parenchymal hyperintensity may suggest edema or pathology affecting venous outflow

MR Venography (MRV):

  • Best sequence for visualizing anterior hippocampal veins

  • TOF (time-of-flight) or contrast-enhanced MRV depicts veins as bright, enhancing linear or tubular structures draining into the basal vein of Rosenthal

  • Useful for detecting venous variations, thrombosis, or displacement by mass lesions

T1 Post-Contrast (Gadolinium-enhanced MRI):

  • Veins enhance strongly, allowing delineation of their course and connections

  • Helpful for evaluating venous malformations, venous compression, or abnormal collaterals

CT Appearance

Non-contrast CT:

  • Veins are not directly visualized due to their small caliber

  • Secondary signs of venous pathology may include edema, mass effect, or hemorrhage

CT Venography (CTV):

  • Demonstrates the anterior hippocampal veins as opacified, enhancing venous channels

  • Shows their connection to the basal vein of Rosenthal and deep venous system

  • Excellent for assessing venous thrombosis, displacement, or surgical planning in temporal lobe lesions

MRI images

Anterior hippocampal veins mri SAG image -img-00000-00000

MRI images

Anterior hippocampal veins