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Diagnosing Common Carotid Artery Lesions: Imaging & Examination Guide

Evaluating the common carotid artery (CCA) for lesions (atherosclerotic plaque, dissection, aneurysm, fibromuscular dysplasia, tumor) requires a stepwise approach combining clinical assessment and imaging.

1. Clinical Assessment

  • History: TIA/stroke symptoms (amaurosis fugax, hemispheric), neck pain, pulsatile mass, bruit, vascular risk factors.
  • Exam: Carotid auscultation (bruit = turbulent flow, suggests ≥50% stenosis), palpation (thrill, expansile mass), blood pressure bilateral, neurologic exam.

2. First-Line Imaging: Carotid Duplex Ultrasound

  • Non-invasive, no radiation/contrast.
  • B-mode: Plaque morphology (echolucent = unstable, calcified = stable), intima-media thickness (IMT).
  • Doppler: Peak systolic velocity (PSV), end-diastolic velocity (EDV), ICA/CCA PSV ratio → stenosis grading (NASCET/ECST criteria).
  • Sensitivity/specificity >90% for ≥50% stenosis.

3. Cross-Sectional Imaging (Anatomic Detail)

  • CT Angiography (CTA): Fast, high spatial resolution. Excellent for calcified plaque, dissection flap, aneurysm, stent evaluation. Contrast + radiation.
  • MR Angiography (MRA): No radiation. TOF (time-of-flight) or contrast-enhanced. Superior for soft tissue (vessel wall, hematoma in dissection, perivascular inflammation). Claustrophobia, metal contraindications.
  • MRI Neck: Vessel wall imaging (black-blood sequences) for plaque composition, inflammation (vulnerable plaque).

4. Digital Subtraction Angiography (DSA)

  • Gold standard for lumenography.
  • Invasive: femoral/radial access, contrast, radiation, stroke risk ~0.5–1%.
  • Reserved for pre-intervention planning (stenting, endarterectomy) or when non-invasive imaging equivocal.

Selection Algorithm

  1. Screening / initial eval → Duplex US
  2. Surgical/stent planning → CTA or CE-MRA (often both)
  3. Dissection / vasculitis / complex anatomy → MRA + MRI vessel wall
  4. Intervention → DSA

Multidisciplinary vascular team (neurology, neurosurgery, vascular surgery, radiology) optimizes management.

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