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Diffusion-weighted MRI and ADC mapping in FK506 neurotoxicity

Departments of ¹ Diagnostic Radiology, ² Neurology and ³ Haematology, The Catholic University of Korea, Seoul, Korea

Correspondence: Dr S T Hahn, Department of Radiology, St Mary's Hospital, #62 Youido-Dong, Yongdeungpo-Gu, Seoul 150–713, Korea

FK506 is a newly developed potent immunosuppressant for preventing rejection after organ transplantation. However, FK506 can induce central nervous system toxicity. Until now the pathogenic mechanism of FK506 neurotoxicity was unclear. We report the findings of diffusion-weighted MRI and apparent diffusion coefficient (ADC) mapping of a FK506 neurotoxicity patient who showed increased signal intensities in both parieto-occipital lobes on T₂ weighted images, diffusion-weighted images and ADC maps. These findings suggest that a vasogenic oedema rather than a cytotoxic oedema may play a pivotal role in FK506 neurotoxicity pathogenesis.

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