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Acknowledgements The National Hospital for Neurology and Neurosurgery.
Contributors AD: Helped manage the case. initiated, drafted and revised the paper. She is the second guarantor. CW: revised the paper. She edited the images. DD: helped manage the case. Revised the paper. DK: revised the paper. He is the senior guarantor.
Competing interests None.
Patient consent Obtained.
Provenance and peer review Not commissioned; externally peer reviewed. This paper was reviewed by William Whiteley, Edinburgh.