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Superior thalamic veins

The superior thalamic veins are small but clinically significant veins that drain the superior portions of the thalamus and contribute to the deep venous system of the brain. They play an essential role in draining blood from the thalamus to the internal cerebral veins, thus forming a critical part of the deep cerebral venous circulation. Understanding their anatomy, variants, and imaging characteristics is important for accurate interpretation of neuroimaging and for surgical or interventional planning in neurosurgery and neuroradiology.

Synonyms

  • Superior Internal Thalamic Veins

  • Thalamostriate Vein (sometimes used interchangeably, though technically distinct)

  • Upper Thalamic Veins

Function

  • Drain the superior aspects of the thalamus

  • Transport deoxygenated blood from the thalamus to the internal cerebral veins

  • Play a role in maintaining normal intracerebral venous pressure and outflow

  • Important in the context of deep venous thrombosis or infarcts affecting the thalamus

Anatomical Course

  • Originate from the superior part of the thalamus

  • Run along the superior thalamic surface, often parallel to the thalamostriate vein

  • Drain into the internal cerebral vein

  • Paired (right and left) and variable in number and caliber

MRI Appearance

  • T2-Weighted Images:

    • Seen as small flow voids or hypointense linear structures adjacent to the superior surface of the thalamus

    • May not always be distinctly visualized due to small size

  • T1-Weighted Images:

    • Appear as low-signal intensity linear structures

  • 3D Phase Contrast (PC 3D) MRV:

    • Superior thalamic veins may be visualized as thin linear flow-related hyperintensities

    • Enhanced visualization due to flow sensitivity

    • Can be traced to the internal cerebral veins

  • Post-Contrast T1-Weighted Images:

    • Appear as linear or tubular enhancing structures, following administration of gadolinium contrast

    • Enhancement is typically homogeneous if veins are patent

    • Useful for distinguishing veins from non-enhancing structures or pathology

CT and CTV Appearance

  • Non-Contrast CT:

    • Not directly visualized due to small caliber

    • May be inferred by the absence of hyperdense structures in the expected location

    • Indirectly assessed when evaluating for deep venous thrombosis or hemorrhage

  • CT Venography (CTV):

    • May show faint opacification as thin linear structures adjacent to the superior thalamus

    • Best appreciated on high-resolution, thin-slice multiplanar reconstructions

MRI images

Superior thalamic veins MRI 3T sagittal image 1

MRI images

Superior thalamic veins MRI 3T sagittal image