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A clear relationship was observed between the onset of involuntary movements and the cognitive impairment and worsening of haematological parameters in the patient. After causal and symptomatic treatment, the patient\u2019s clinical status improved. In the elderly, PV must be considered as a cause of acute chorea and sudden cognitive impairment, as early diagnosis leads to effective treatment and prevention of complications.<\/jats:p>","DOI":"10.1136\/bcr-2017-223867","type":"journal-article","created":{"date-parts":[[2018,5,15]],"date-time":"2018-05-15T02:25:18Z","timestamp":1526351118000},"page":"bcr-2017-223867","update-policy":"https:\/\/doi.org\/10.1136\/crossmarkpolicy","source":"Crossref","is-referenced-by-count":2,"title":["Sudden hemichorea and frontal lobe syndrome: a rare presentation of unbalanced polycythaemia vera"],"prefix":"10.1136","volume":"2018","author":[{"given":"Carmen","family":"Garc\u00eda-Cabo","sequence":"first","affiliation":[{"name":"Department of Neurology, Centro Medico de Asturias, Oviedo, Asturias, Spain"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Jessica","family":"Fernandez-Dominguez","sequence":"additional","affiliation":[{"name":"Department of Neurology, Centro Medico de Asturias, Oviedo, Asturias, Spain"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Valent\u00edn","family":"Mateos","sequence":"additional","affiliation":[{"name":"Department of Neurology, Centro Medico de Asturias, Oviedo, Asturias, Spain"}],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"239","published-online":{"date-parts":[[2018,5,14]]},"reference":[{"key":"2025082623382930000_2018.may14_1.bcr-2017-223867.1","unstructured":"Shannon MK . 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