Published Online
on November 7, 2002

A more recent version of this article appeared on December 1, 2002

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Submitted on June 25, 2002
Accepted on July 8, 2002

Monitoring Disease Progression in CADASIL With Diffusion Magnetic Resonance Imaging. A Study With Whole Brain Histogram Analysis

Nicolas Molko MD; Sabina Pappata MD; Jean-François Mangin PhD; Fabrice Poupon PhD; Denis LeBihan MD, PhD; Marie-Germaine Bousser MD; and Hugues Chabriat MD, PhD^*

From INSERM U334 (N.M., S.P.) and UNAF (J-F.M., F.P., D.L., M-G.B., H.C.), IFR 49, SHFJ-CEA, Orsay, and Department of Neurology, CHU Lariboisière (H.C.), Paris, France.

^* To whom correspondence should be addressed. E-mail: hugues.chabriat{at}lrb.ap-hop-paris.fr.

Background and Purpose—In cerebral autosomal dominant arteriopathy with subcortical infarcts and leukoencephalopathy (CADASIL), a large increase in water diffusion has been found both inside and outside the cerebral lesions as detected on conventional MRI. The aim of the present study was to assess the sensitivity of diffusion tensor imaging for monitoring the progression of cerebral tissue damage during the course of CADASIL.

Methods—With the use of diffusion tensor imaging, whole brain trace of the diffusion tensor [Trace(D)] histograms were obtained in 22 CADASIL patients and 12 age-matched controls at baseline, in 14 patients after a mean delay of 21 months, and in 5 controls after a mean delay of 29 months. Parameters derived from these histograms (mean value, peak height, and peak location) were analyzed at baseline and during the follow-up.

Results—At baseline, all the histogram parameters differed between patients and controls and were found to be significantly correlated with both the Mini-Mental State Examination score and Rankin Scale score in the patient group. The follow-up study showed a decrease in the peak height associated with an increase in the mean value of whole brain Trace(D) histograms in the 14 CADASIL patients scanned twice. The diffusion changes appeared larger in the patients whose Rankin score increased during the study period.

Conclusions—These results suggest that the measurement of water diffusion over time is a sensitive marker for the progression of tissue damage in the brain. Thus, quantitative diffusion MRI can be used to monitor disease progression in CADASIL and possibly in other types of small-vessel brain disorders.

Key words: CADASIL • magnetic resonance imaging

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