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Superficial circumflex iliac artery

The superficial circumflex iliac artery (SCIA) is a branch of the femoral artery near its origin, just below the inguinal ligament. It courses laterally, running parallel to the inguinal ligament toward the anterior superior iliac spine (ASIS), and supplies the skin and superficial fascia of the lower anterolateral abdominal wall, groin, and upper thigh.

The SCIA typically gives off a superficial branch (supplying subcutaneous tissues and skin) and a deep branch (which pierces fascia to supply adjacent muscles and anastomose with the deep circumflex iliac artery).

Clinically, the SCIA is important as the vascular pedicle of the SCIA flap, used in reconstructive plastic surgery for coverage of soft tissue defects. It also has relevance in inguinal hernia surgery, groin trauma, and abdominal wall reconstructions, where injury may cause hemorrhage.

Synonyms

  • Arteria circumflexa ilium superficialis

  • Superficial iliac circumflex artery

Function

  • Supplies the skin, superficial fascia, and subcutaneous tissue of the groin and lower abdominal wall

  • Provides blood to portions of the tensor fasciae latae and sartorius regions via muscular branches

  • Contributes to collateral circulation with deep circumflex iliac and inferior epigastric arteries

  • Serves as vascular pedicle for SCIA flap in reconstructive surgery

MRI Appearance

T1-weighted images:

  • Appears as a thin hypointense flow void within bright subcutaneous fat near the inguinal ligament

  • Surrounded by high signal fat, aiding visualization

T2-weighted images:

  • Vessel lumen: signal void with flow

  • Pathology (thrombosis or aneurysm): altered intermediate or hyperintense intraluminal signal

STIR:

  • Suppresses fat, improving detection of the artery within subcutaneous tissues

  • Perivascular edema or hematoma appears hyperintense

T1 Fat-Suppressed Post-Gadolinium:

  • Artery enhances brightly and homogeneously

  • Defines superficial vs deep branches and their anastomoses with the DCIA

  • Useful for SCIA flap surgical planning

MRA Pelvis with Gadolinium:

  • Demonstrates origin from femoral artery, superficial and deep branches, and course toward ASIS

  • Provides vascular mapping of SCIA flap pedicle

  • Detects variants, collateral flow, or pathologic changes

CT Appearance

Non-contrast CT:

  • Difficult to visualize unless calcified

  • Seen as a small tubular density in the groin region

CT Post-Contrast:

  • Vessel opacifies clearly

  • Shows superficial and deep branches supplying groin and abdominal wall

  • Useful for trauma and flap vascular assessment

CT Angiography (CTA):

  • Gold standard for evaluating SCIA in detail

  • Multiplanar and 3D reconstructions demonstrate origin, trajectory, superficial vs deep branches, and anastomoses with DCIA and inferior epigastric artery

  • Essential in preoperative flap planning, vascular variant mapping, and trauma evaluation

CT VRT 3D image

Superficial circumflex iliac artery 3d image

CT image

Superficial circumflex iliac artery CT axial image MRI axial anatomy image-img-00000-00000

MRI image

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