Dissection Syndromes Workup
- Author: Chelsea S Kidwell, MD; Chief Editor: Helmi L Lutsep, MD more...
Laboratory studies are primarily used to exclude an underlying connective tissue disorder.
Studies may include erythrocyte sedimentation rate (ESR), antinuclear antibody (ANA), alpha 1-antitrypsin, and homocysteine level.
Historically, catheter angiography has been considered the criterion standard for diagnosing cervicocephalic dissections. A variety of abnormal patterns may be seen (see image below). The diagnosis is confirmed if an intimal flap or double-barrel lumen (secondary to a dissecting aneurysm) is seen.
Frequently, only irregular vessel narrowing may be found, often with a string sign, gradual vessel tapering, and/or distal embolic occlusions. While these findings may suggest an underlying dissection, in some patients they may not be diagnostic. Evidence of fibromuscular dysplasia or vessel tortuosity also may be found, suggesting an underlying predisposing condition.
Brain magnetic resonance imaging (MRI) may be normal or show evidence of infarction related to the dissection. Magnetic resonance angiography (MRA) may show patterns similar to those on catheter angiography, but this study is frequently not as sensitive. Axial T1 sequences through the vessel lumen may be particularly helpful in confirming diagnosis, especially if a crescent sign (elliptical bright signal within a vessel wall that surrounds a signal flow void) is visualized (see image below).
Computed tomography angiography (CTA) may show patterns similar to those seen on MRA or catheter angiography.
In proximal carotid dissections, carotid duplex ultrasonography most commonly shows evidence of a distal severe stenosis or occlusion. Occasionally, a double lumen may be visualized on B mode imaging.
Transcranial Doppler studies may demonstrate collateral flow patterns or evidence of microemboli.
Lumbar puncture may be performed in selected patients with intracranial vessel dissections to exclude subarachnoid hemorrhage.
Connective tissue biopsy may be performed in patients in whom an underlying connective tissue disorder is suspected.
Pathologic specimens commonly demonstrate evidence of an intramural hematoma. In some patients, evidence of an underlying connective tissue disorder or arteriopathy may be identified.
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