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Craniocervical artery dissection: MR imaging and MR angiographic findings
M Oelerich1, F Stögbauer, G Kurlemann
1Institute of Clinical Radiology, University of Münster, Albert-Schweitzer-Strasse 33, D-48129 Münster, Germany.
Insights
Craniocervical artery dissection (CCAD) is a key stroke cause in young patients. MRI with MRA is the preferred diagnostic tool, visualizing intramural hematoma for accurate CCAD diagnosis and follow-up.
Area of Science:
- Vascular Neurology
- Neuroradiology
- Medical Imaging
Background:
- Cervical artery dissection, including carotid and vertebral arteries, is a significant cause of stroke, particularly in younger demographics.
- Understanding dissection mechanisms, differentiating it from atherosclerotic disease, and employing appropriate diagnostic methods are crucial for patient management.
Purpose of the Study:
- To evaluate the diagnostic accuracy of various imaging modalities for craniocervical artery dissection (CCAD).
- To establish the optimal imaging technique for the initial diagnosis and follow-up of CCAD.
Main Methods:
- Review of digital subtraction angiography (DSA) findings in CCAD.
- Assessment of non-invasive techniques: time-of-flight magnetic resonance angiography (MRA) and computed tomography angiography (CTA).
- Emphasis on magnetic resonance (MR) imaging for direct visualization of intramural hematoma using T1- and T2-weighted sequences.
Main Results:
- DSA shows luminal compromise but lacks specificity for dissection.
- MRA and CTA demonstrate high accuracy comparable to DSA.
- MR imaging excels in visualizing intramural hematoma, a hallmark of dissection, via signal changes from blood degradation products.
Conclusions:
- MRI, particularly in conjunction with MRA, is the method of choice for diagnosing and monitoring craniocervical artery dissection (CCAD).
- CTA serves as a valuable non-invasive alternative in cases where MRI is inconclusive or contraindicated.
Abstract:
Dissection of the carotid and vertebral arteries is a not so uncommon cause of stroke and has to be considered as a differential diagnosis especially in younger patients. Therapeutic and prognostic implications are different from those in extracranial atherosclerotic disease. Dissection results from hemorrhage into the vessel wall usually between the layers of the media. Digital subtraction angiography (DSA) depicts the resulting luminal compromise that may reveal some typical, but not specific, findings. The same is true for non-invasive angiographic techniques such as time-of-flight magnetic resonance angiography (MRA) and computed tomography angiography (CTA), which have shown accurate results compared with DSA. The main advantage of these techniques is the direct visualization of the vessel wall confirming the intramural hematoma. This is achieved best with MR imaging due to the high signal of blood degradation products on T1- and T2-weighted images. Therefore, MRI in combination with MRA is presently the method of choice for initial diagnosis and follow-up of craniocervical artery dissection (CCAD). In some questionable cases, CTA is a non-invasive alternative that is independent of flow phenomena.