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Superior ophthalmic vein

The superior ophthalmic vein (SOV) is a crucial vascular structure of the orbit, serving as the main venous drainage pathway for the orbit and connecting the facial and cavernous sinus venous systems. Its anatomical course, connections, and visibility on imaging make it clinically significant, especially in the context of orbital and cavernous sinus pathology.

Synonyms:

  • SOV

  • Orbital superior vein

  • Vena ophthalmica superior

Function:

  • Main venous drainage of the orbit

  • Drains blood from the eyeball, extraocular muscles, lacrimal gland, and orbital structures

  • Communicates with facial veins (notably angular vein) and cavernous sinus

  • Plays a role in the spread of infection or thrombus from the face to intracranial venous sinuses

MRI Appearance:

  • T1-weighted (T1):

    • Normally appears as a tubular or ovoid flow void (signal loss) due to rapid blood flow

    • If thrombosed, may appear hyperintense or isointense, depending on clot age

  • T2-weighted (T2):

    • Typically shows as a flow void (black vessel) in patent SOV

    • Thrombosed SOV may appear hyperintense or heterogeneous

  • STIR (Short Tau Inversion Recovery):

    • Patent SOV: dark flow void

    • Thrombosed SOV: high signal intensity (bright) if there is edema, inflammation, or subacute clot

    • Useful in detecting surrounding orbital edema or cellulitis

CT Appearance:

  • Non-contrast CT:

    • SOV may not be clearly seen unless distended or thrombosed

    • Can appear as a slightly hyperdense tubular structure if thrombosed

    • Proptosis or orbital edema may be present if pathology exists

  • Contrast-enhanced CT:

    • Patent SOV enhances homogeneously

    • Thrombosed SOV shows filling defect or non-enhancement

MRI images

Superior ophthalmic vein mri image