Vessel Wall Thickening and Enhancement in High-Resolution Intracranial Vessel Wall Imaging: A Predictor of Future Ischemic Events in Moyamoya Disease

Abstract

BACKGROUND AND PURPOSE: Very few data are available with regard to high-resolution intracranial vessel wall imaging characteristics of Moyamoya disease and their relation to ischemic stroke risk. We investigated the high resolution imaging characteristics of MMD and its correlation with recent ischemic events. MATERIALS AND METHODS:Patients with Moyamoya disease confirmed by DSA, including patients after revascularization, were enrolled. All the patients underwent high-resolution intracranial vessel wall imaging. Vessel wall thickening, enhancement, and the remodeling index of the bilateral distal ICA and proximal MCA were noted. The patients were followed up at 3 months and 6 months after high-resolution intracranial vessel wall imaging and the association of ischemic events with imaging characteristics was assessed. RESULTS:Twenty-nine patients with Moyamoya disease were enrolled. The median age at symptom onset was 12 years (range, 1-51 years). A total of 166 steno-occlusive lesions were detected by high-resolution intracranial vessel wall imaging. Eleven lesions with concentric wall thickening (6.6%) were noted in 9 patients. Ten concentric contrast-enhancing lesions were observed in 8 patients, of which 3 patients (4 lesions) showed grade II enhancement. The presence of contrast enhancement (P 4 .01) and wall thickening (P # .001) showed a statistically significant association with ischemic events within 3 months before and after the vessel wall imaging. Grade II enhancement showed a statistically significant (P 4 .02) association with ischemic events within 4 weeks of high-resolution intracranial vessel wall imaging. The mean 6 standard deviation outer diameter of the distal ICA (right, À3.3 6 0.68 mm; left, 3.4 6 0.60 mm) and the remodeling index (right, 0.71 6 0.13; left, 0.69 6 0.13) were lower in Moyamoya disease. CONCLUSIONS:High-resolution intracranial vessel wall imaging characteristics of concentric wall thickening and enhancement are relatively rare in our cohort of patients with Moyamoya disease. The presence of wall thickening and enhancement may predict future ischemic events in patients with Moyamoya disease. ABBREVIATIONS: ACA 4 anterior cerebral artery; HRVWI 4 high-resolution intracranial vessel wall imaging; MMD 4 Moyamoya disease; PCA 4 posterior cerebral artery; SD 4 standard deviation Indicates open access to non-subscribers at www.ajnr.org http://dx.

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