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great saphenous vein

The great saphenous vein (GSV), also known as the long saphenous vein, is the longest superficial vein in the body. It originates from the dorsal venous arch of the foot on the medial side, ascends anterior to the medial malleolus, passes along the medial leg and thigh, and drains into the femoral vein at the saphenofemoral junction (SFJ) in the groin.

The GSV has multiple tributaries, including the accessory saphenous veins (anterior and posterior), and communicates with the deep venous system via perforator veins. It contains multiple bicuspid valves to prevent reflux, though incompetence of these valves is a major cause of varicose veins and chronic venous insufficiency.

Clinically, the GSV is important in coronary artery bypass grafting (CABG), varicose vein surgery, deep vein thrombosis evaluation, and venous mapping.

Synonyms

  • Long saphenous vein

  • Vena saphena magna

Function

  • Primary superficial venous drainage of medial lower limb

  • Communicates with deep veins via perforators

  • Serves as an important collateral venous pathway in deep venous thrombosis

  • Provides graft material in vascular surgery (CABG, peripheral bypass)

MRI Appearance

  • T1-weighted images:

    • Normal GSV: intermediate signal lumen with well-defined wall

    • Flowing blood: low signal, but slow flow may appear bright (flow-related enhancement)

    • Fat surrounding vein: bright, aiding identification

    • Thrombus: intermediate-to-high signal, depending on stage of organization

  • T2-weighted images:

    • Normal vein: intermediate-to-low signal

    • Slow flow or stasis: appears bright due to reduced flow void

    • Thrombus: hyperintense in acute phase, hypointense when chronic

    • Excellent for detecting perivenous inflammation or varicosity

  • STIR:

    • Normal GSV: low to intermediate signal

    • Slow flow or thrombosis: bright hyperintense signal

    • Highlights edema, cellulitis, or inflammation in thrombophlebitis

  • Proton Density Fat-Saturated (PD FS):

    • Normal vein: dark circular lumen

    • Slow flow or thrombus: hyperintense signal within lumen

    • Wall thickening and perivenous edema: bright and well-demarcated

  • T1 Fat-Sat Post-Contrast:

    • Normal vein: homogeneous enhancement of lumen

    • Thrombus: appears as non-enhancing filling defect

    • Venous wall enhancement: indicates inflammation, thrombophlebitis, or recanalization

    • Slow flow: gradual delayed enhancement in dependent segments

MR Venography (MRV) – Contrast Enhanced

  • Technique: Gadolinium-enhanced 3D MRV or time-resolved MRV

  • Normal appearance: Continuous, smooth tubular structure extending from ankle to groin

  • Valves: May appear as tiny filling indentations within the lumen

  • Thrombosis: Filling defect or non-enhancing region within lumen

  • Reflux: Demonstrated as retrograde enhancement in dependent segments

  • Slow flow: Bright on early T1-weighted post-contrast images due to pooling of contrast

  • Excellent for evaluating varicosities, reflux patterns, and saphenofemoral junction competency

CT Appearance

Non-contrast CT:

  • GSV difficult to visualize

  • May appear as tubular soft tissue density in medial thigh/leg

CT Post-Contrast:

  • Vein enhances as a superficial vessel along medial leg and thigh

  • Useful in identifying engorgement, dilation, or extrinsic compression

CTV (CT Venography):

  • Normal signal: enhancing vein lumen appears bright hyperdense

  • Thrombosis: filling defect within enhancing vein

  • 3D reconstructions show full GSV pathway, perforators, and junction with femoral vein

  • Valuable for DVT exclusion, varicose vein mapping, and surgical planning

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Great saphenous vein ct axial

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Great saphenous vein anatomy

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