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Reversible Posterior Leukoencephalopathy Syndrome: Evaluation with Diffusion-Tensor MR Imaging¹

¹ From the Mallinckrodt Institute of Radiology, Washington University School of Medicine, 510 S Kingshighway Blvd, St Louis, MO 63110. From the 2000 RSNA scientific assembly. Received February 10, 2000; revision requested April 5; final revision received October 10; accepted November 1. Address correspondence to P.M. (e-mail: mukherjeep@mir.wustl.edu).

PURPOSE: To characterize the changes in brain water diffusion caused by reversible posterior leukoencephalopathy syndrome (RPLS).

MATERIALS AND METHODS: Twelve patients with the clinical features and conventional magnetic resonance (MR) imaging findings of RPLS underwent diffusion-tensor echo-planar MR imaging. The isotropic diffusion coefficient () and diffusion anisotropy (A) were measured in posterior regions of diffusion abnormality and in anterior areas of normal-appearing brain.

RESULTS: Across all 12 subjects, the mean of (1.09 ± 0.13 [SD]) x 10^-3 mm²/sec in affected posterior regions was 26% greater than its value of (0.87 ± 0.07) x 10^-3 mm²/sec in normal-appearing anterior regions. The mean A of 0.15 ± 0.03 in posterior regions was 35% less than its value of 0.23 ± 0.02 in anterior regions (t₁₁ = 9.58; P < .001). There was a significant inverse correlation between and A in posterior regions (r = -0.67; P < .018) but not in anterior regions (r = -0.12; P = .719). A follow-up study performed in one patient after resolution of symptoms documented reversal of elevated isotropic diffusion and at least partial recovery of anisotropy loss.

CONCLUSION: The increased magnitude of brain water diffusion characteristic of RPLS is accompanied by reduced A. The magnitudes of these two effects are correlated and may be reversible. These observations support the proposal that vasogenic edema due to cerebrovascular autoregulatory dysfunction is the underlying pathophysiologic mechanism in uncomplicated RPLS.

Index terms: Anisotropy • Brain, diffusion, 10.12144, 10.92 • Brain, diseases, 10.872 • Brain, gray matter, 10.92 • Brain, MR, 10.121413, 10.121416, 10.12144 • Brain, white matter, 10.92 • Diffusion tensor • Magnetic resonance (MR), diffusion study, 10.12144, 10.92 • Magnetic resonance (MR), rapid imaging, 10.121413

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