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Superficial circumflex iliac vein

he superficial circumflex iliac vein (SCIV) is a superficial vein of the anterior abdominal wall and upper thigh. It accompanies the superficial circumflex iliac artery and drains into the great saphenous vein (GSV) near the saphenofemoral junction (SFJ), or occasionally into the femoral vein directly.

The SCIV runs laterally, parallel to the inguinal ligament, and drains blood from the lower abdominal wall, inguinal region, and upper lateral thigh. It communicates with superficial epigastric and superficial external pudendal veins, forming part of the superficial venous ring of the groin.

Clinically, the SCIV is relevant as a tributary of the SFJ, often involved in superficial venous insufficiency, varicosities, and recurrent varicose veins after surgery. It must be identified in saphenofemoral ligation and endovenous interventions.

Synonyms

  • Vena circumflexa ilium superficialis

  • SCIV

  • Superficial iliac vein of groin

Function

  • Drains venous blood from the lateral anterior abdominal wall and upper lateral thigh

  • Empties into the GSV near the saphenofemoral junction

  • Provides collateral venous return with superficial epigastric and external pudendal veins

  • Clinical importance in varicose vein disease and venous reflux

MRI Appearance

T1-weighted images:

  • SCIV appears as a linear hypointense structure in subcutaneous fat near inguinal ligament

  • Surrounded by hyperintense fat planes

T2-weighted images:

  • Flowing blood: signal void

  • Thrombosis: lumen appears hyperintense relative to muscle

STIR:

  • Suppresses fat, making SCIV and perivenous edema more conspicuous

  • Highlights thrombophlebitis or inflammation

T1 Fat-Suppressed Post-Gadolinium:

  • Enhances brightly and homogeneously with contrast

  • Outlines tributary course toward GSV at SFJ

  • Detects varicose tributaries and venous neovascularization

MRV (Magnetic Resonance Venography):

  • Normal signal: flowing blood appears bright hyperintense on contrast MRV

  • Thrombosed vein: hypointense, non-enhancing filling defect

  • Maps SCIV connection to GSV and femoral vein, useful for varicose vein surgery planning

CT Appearance

Non-contrast CT:

  • SCIV faintly visible as tubular density in superficial fat near inguinal ligament

  • Often indistinguishable without contrast

CT Post-Contrast:

  • Vein enhances clearly, demonstrating its superficial course and termination

  • Useful in evaluating dilated tributaries or venous compression

CTV (CT Venography):

  • Normal signal: lumen enhances as bright hyperdense channel

  • Thrombosis: seen as filling defect within enhancing vein

  • Provides multiplanar and 3D reconstructions of SCIV, its junction with GSV, and related tributaries

  • Crucial in planning surgical or endovenous treatment for recurrent varicose veins

CT image

Superficial circumflex iliac vein ct coronal image

MRI image

Superficial circumflex iliac vein MRI axial anatomy image-img-00000-00000