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St. Louis Encephalitis and the Substantia Nigra: MR Imaging Evaluation

Felix Cernaa, Borna Mehrada, James P. LubyGo,a, Dennis Burnsa and James L. Fleckensteina

a From the Departments of Internal Medicine, Division of Infectious Diseases (F.C., B.M., J.P.L.), Pathology (D.B.), and Radiology, Division of Neuroradiology (J.L.F.), The University of Texas Southwestern Medical Center at Dallas, Dallas, TX.



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  		FIG 1. MR images of StLE.

A and B, Case 1: Balanced 2500/30 (TR/TE) image (A) shows hyperintensity in the substantia nigra bilaterally (arrows).T2-weighted 2500/120 image (B) obtained at same level as that shown in A shows hyperintensity in the substantia nigra more conspicuously. C, Case 2: T2-weighted 2500/120 image shows asymmetrical hyperintensity of the subtantia nigra with the right side more involved (arrow).





Copyright © 2008 by the American Society of Neuroradiology. Print ISSN: 0195-6108 Online ISSN: 1936-959X