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. 2017 Oct 11;2017:bcr2017220990. doi: 10.1136/bcr-2017-220990

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© BMJ Publishing Group Ltd (unless otherwise stated in the text of the article) 2017. All rights reserved. No commercial use is permitted unless otherwise expressly granted.

This is an Open Access article distributed in accordance with the Creative Commons Attribution Non Commercial (CC BY-NC 4.0) license, which permits others to distribute, remix, adapt, build upon this work non-commercially, and license their derivative works on different terms, provided the original work is properly cited and the use is non-commercial. See: http://creativecommons.org/licenses/by-nc/4.0/

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Follow-up MRI of the brain. Transverse T2-weighted image, diffusion-weighted image (DWI) and corresponding apparent diffusion coefficient (ADC) map (left to right). Transverse T2-weighted image of the posterior fossa shows confluent hyperintense white matter changes in both cerebellar hemispheres. On the right more than left side, there is extension through the middle cerebellar peduncle into the brainstem. DWI depicts high signal in the periphery of the white matter lesions left more than right (arrowheads) with corresponding low signal on the ADC map (arrowheads), consistent with restricted diffusion. There was no contrast enhancement (not shown).