Topics

Topic

design image
Internal carotid artery (cervical part)

The internal carotid artery (cervical part) is the initial segment of the internal carotid artery that arises from the bifurcation of the common carotid artery, ascending vertically within the neck to reach the base of the skull. Unlike the external carotid artery, the cervical part of the ICA gives off no branches in the neck and travels within the carotid sheath, accompanied by the internal jugular vein and vagus nerve. This section plays a crucial role in supplying blood to the brain and other intracranial structures. Its identification and evaluation on imaging are essential for diagnosing vascular diseases, planning surgical interventions, and assessing traumatic or atherosclerotic changes.

Synonyms

  • Cervical segment of the internal carotid artery

  • ICA cervical segment

  • C1 segment (Bouthillier classification)

  • Extracranial ICA (cervical part)

Function

  • Conducts oxygenated blood from the common carotid artery to the intracranial segments, ultimately supplying the brain.

  • Acts as a conduit without branching in the neck.

  • Plays a vital role in cerebral perfusion, especially in cases of carotid artery disease.

MRI Appearance

  • T1-weighted:

    • Lumen appears as a flow void (dark signal) due to rapid arterial blood flow.

    • Vessel wall may be seen if there is disease (e.g., atherosclerosis or dissection).

  • T2-weighted:

    • Also demonstrates a flow void in the lumen.

    • Perivascular tissues appear hyperintense compared to the artery.

  • STIR (Short Tau Inversion Recovery):

    • Lumen typically appears as a signal void.

    • Helpful for identifying surrounding soft tissue edema or pathology.

  • TOF (Time-of-Flight) MR Angiography:

    • ICA is seen as a bright/high-signal structure due to flow-related enhancement.

    • Excellent for non-contrast visualization of vessel patency and stenosis.

CT Appearance

  • Appears as a round or oval low-attenuation structure (lumen) with a thin, enhancing wall after intravenous contrast administration.

  • Surrounding fat planes may help delineate the artery from adjacent structures.

  • Calcifications, if present, are seen as high-attenuation foci within the vessel wall in cases of atherosclerosis.

CTA (CT Angiography) Appearance

  • Cervical ICA enhances brightly following contrast injection, providing clear visualization of the vessel lumen and wall.

  • Allows for accurate assessment of vessel patency, stenosis, occlusion, and dissection.

  •  

MRI images

Internal carotid artery (cervical part) axial image

MRI images

Internal carotid artery (cervical part) mri coronal image