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(Stroke. 2001;32:2810.)
© 2001 American Heart Association, Inc.

Original Contributions

MR Perfusion Imaging in Moyamoya Syndrome

Potential Implications for Clinical Evaluation of Occlusive Cerebrovascular Disease

F. Calamante, PhD; V. Ganesan, MD; F.J. Kirkham, MB, BChir; W. Jan, MBBS; W.K. Chong, MD, FRCR; D.G. Gadian, DPhil A. Connelly, PhD

From the Radiology and Physics (F.C., D.G.G., A.C.) and Neurosciences (V.G., F.J.K.) Units, Institute of Child Health, University College London, and the Department of Radiology, Great Ormond Street Hospital (W.J., W.K.C.), London, UK.

Correspondence to Dr Fernando Calamante, Radiology and Physics Unit, Institute of Child Health, University College London, 30 Guilford St, London WC1N 1EH, UK. E-mail cfernan{at}ich.ucl.ac.uk

Background and Purpose— Ischemic symptoms in patients with moyamoya syndrome (MMS) are usually due to hemodynamically mediated perfusion failure, and identification of abnormal tissue perfusion in these patients is therefore clinically important. Although dynamic susceptibility contrast (DSC) MRI can be used to study tissue perfusion, there are potential technical problems in MMS. This study investigates the scope and limitations of perfusion MRI in the clinical evaluation of such patients.

Methods— Thirteen patients with bilateral MMS were studied with the use of structural, diffusion, and perfusion MRI. The DSC MRI data were analyzed both visually and by a quantitative regional analysis, and the relationship between perfusion status and clinical symptoms was investigated.

Results— Extensive bilateral DSC MRI abnormalities were observed in all the patients. There was a very heterogeneous distribution of bolus arrival time. The areas of abnormality included the major arterial border zones in all cases, although these usually appeared normal on structural and diffusion MRI. Only the most clinically unstable patients had peak width (defined as time to peak minus bolus arrival time) >5 seconds on the quantitative regional analysis. Several technical limitations of perfusion quantification in MMS are described, as well as the implications of these limitations in patients with other forms of occlusive large-vessel disease.

Conclusions— The technical limitations of DSC MRI described in this study are important for the accurate interpretation of perfusion MRI in MMS. Despite these limitations, these preliminary findings suggest that the use of quantitative regional analysis of summary parameters may provide clinically useful information in patients with MMS.

Key Words: cerebral ischemia • hypoperfusion • moyamoya disease • perfusion • stenosis

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