{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,4,14]],"date-time":"2026-04-14T00:58:03Z","timestamp":1776128283872,"version":"3.50.1"},"reference-count":11,"publisher":"BMJ","issue":"6","content-domain":{"domain":["bmj.com"],"crossmark-restriction":true},"short-container-title":["Pract Neurol"],"accepted":{"date-parts":[[2024,5,6]]},"published-print":{"date-parts":[[2024,12]]},"abstract":"<jats:p>A man in his mid-20s developed three episodes of right facial weakness over 5 months. He had a history of B-cell acute lymphoblastic leukaemia (ALL) in remission following allogenic stem cell transplantation. MR scan of brain during the second presentation showed facial nerve enhancement; cerebrospinal fluid (CSF) cytology and flow cytometry were negative. Re-assessment at the third presentation identified CSF B-lymphoblasts, and he was subsequently treated for central nervous system relapse of leukaemia. 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