American Journal of Neuroradiology 22:541-552 (3 2001)
© 2001 American Society of Neuroradiology
ARTICLE
Alexander Disease: Diagnosis with MR Imaging
a From the Departments of Child Neurology (M.S.v.d.K.) and Radiology (J.V.), Free University Hospital, Amsterdam, the Netherlands; the Department of Neurogenetics, Kennedy Krieger Institute, Baltimore, MD (S.N.); the Department of Radiology, Johns Hopkins Medical Institute, Baltimore, MD (S.N.B.); the Department of Neuroradiology, Hospital for Sick Children, Toronto, Canada (S.B.); the Department of Child Neurology, St. Elisabeth Hospital, Tilburg, the Netherlands (H.S.); the Department of Pediatrics, Technical University, Munich, Germany (S.S.); the Department of Child Neurology, University Hospital, Groningen, the Netherlands (J.C.B.); the Department of Child Neurology, University Hospital, Gent, Belgium (R.v.C.); the Department of Child Neurology, Academic Medical Center, Amsterdam, the Netherlands (P.G.B.); the Department of Pediatric Neurology, Southampton General Hospital, Southampton, UK (N.H.T.); and the Departments of Pathology and Neurology, University of Rochester Medical School, Rochester NY (J.M.P.).
BACKGROUND AND PURPOSE: To date, the demonstration of Rosenthal fibers on brain biopsy or autopsy specimens is considered a prerequisite for a definitive diagnosis of Alexander disease. We initiated a multiinstitutional survey of MR abnormalities in both presumed and confirmed cases of Alexander disease to assess the possibility of an MR-based diagnosis.
METHODS: MR imaging studies in three patients with an autopsy-based diagnosis of Alexander disease were analyzed to define MR criteria for the diagnosis. These criteria were then applied to 217 children with leukoencephalopathy of unknown origin.
RESULTS: Five MR imaging criteria were defined: extensive cerebral white matter changes with frontal predominance, a periventricular rim with high signal on T1-weighted images and low signal on T2-weighted images, abnormalities of basal ganglia and thalami, brain stem abnormalities, and contrast enhancement of particular gray and white matter structures. Four of the five criteria had to be met for an MR imaging-based diagnosis. In a retrospective analysis of the MR studies of the 217 patients, 19 were found who fulfilled these criteria. No other essentially new MR abnormalities were found in these patients. In four of the 19 patients, subsequent histologic confirmation was obtained. The clinical symptomatology was the same in the patients with and without histologic confirmation and correlated well with the MR abnormalities. MR abnormalities were in close agreement with the known histopathologic findings of Alexander disease.
CONCLUSION: The defined criteria are sufficient for an in vivo MR imaging diagnosis of Alexander disease; only in atypical cases is a brain biopsy still necessary for a definitive diagnosis.
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