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<article xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:ali="http://www.niso.org/schemas/ali/1.0/" article-type="research-article" dtd-version="1.2" xml:lang="en"><front><journal-meta><journal-id journal-id-type="publisher-id">Annals of Clinical and Experimental Neurology</journal-id><journal-title-group><journal-title xml:lang="en">Annals of Clinical and Experimental Neurology</journal-title><trans-title-group xml:lang="ru"><trans-title>Анналы клинической и экспериментальной неврологии</trans-title></trans-title-group></journal-title-group><issn publication-format="print">2075-5473</issn><issn publication-format="electronic">2409-2533</issn><publisher><publisher-name xml:lang="en">Eco-Vector</publisher-name></publisher></journal-meta><article-meta><article-id pub-id-type="publisher-id">836</article-id><article-id pub-id-type="doi">10.54101/ACEN.2022.1.9</article-id><article-categories><subj-group subj-group-type="toc-heading" xml:lang="en"><subject>Clinical analysis</subject></subj-group><subj-group subj-group-type="toc-heading" xml:lang="ru"><subject>Клинический разбор</subject></subj-group><subj-group subj-group-type="article-type"><subject>Research Article</subject></subj-group></article-categories><title-group><article-title xml:lang="en">Corticobasal syndrome as a phenotype of various neurodegenerative disorders: a case series</article-title><trans-title-group xml:lang="ru"><trans-title>Кортикобазальный синдром как фенотипическое проявление различных нейродегенеративных заболеваний: описание серии случаев</trans-title></trans-title-group></title-group><contrib-group><contrib contrib-type="author"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0001-7214-583X</contrib-id><name-alternatives><name xml:lang="en"><surname>Shpilyukova</surname><given-names>Yuliya A.</given-names></name><name xml:lang="ru"><surname>Шпилюкова</surname><given-names>Юлия Александровна</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><bio xml:lang="en"><p>Cand. Sci. (Med.), junior researcher, neurologist, 5<sup>th</sup> Neurology department</p></bio><bio xml:lang="ru"><p>к.м.н., м.н.с., врач-невролог, 5-е неврологическое отделение</p></bio><email>annaly-nevrologii@neurology.ru</email><xref ref-type="aff" rid="aff1"/></contrib><contrib contrib-type="author"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0001-8070-7644</contrib-id><name-alternatives><name xml:lang="en"><surname>Fedotova</surname><given-names>Ekaterina Yu.</given-names></name><name xml:lang="ru"><surname>Федотова</surname><given-names>Екатерина Юрьевна</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><bio xml:lang="en"><p>D. Sci. (Med.), Head of the 5<sup>th</sup> Neurology department</p></bio><bio xml:lang="ru"><p>д.м.н., рук. 5-го неврологического отделения</p></bio><email>annaly-nevrologii@neurology.ru</email><xref ref-type="aff" rid="aff1"/></contrib><contrib contrib-type="author"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0002-2704-6282</contrib-id><name-alternatives><name xml:lang="en"><surname>Illarioshkin</surname><given-names>Sergey N.</given-names></name><name xml:lang="ru"><surname>Иллариошкин</surname><given-names>Сергей Николаевич</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><bio xml:lang="en"><p>D. Sci. (Med.), Prof., Corr. Member of the Russian Academy of Sciences, Deputy Director, Head, Department for brain research</p></bio><bio xml:lang="ru"><p>д.м.н., проф., член-корр. РАН, зам. директора по научной работе, рук. отдела исследований мозга</p></bio><email>annaly-nevrologii@neurology.ru</email><xref ref-type="aff" rid="aff1"/></contrib></contrib-group><aff-alternatives id="aff1"><aff><institution xml:lang="en">Research Center of Neurology</institution></aff><aff><institution xml:lang="ru">ФГБНУ «Научный центр неврологии»</institution></aff></aff-alternatives><pub-date date-type="pub" iso-8601-date="2022-01-15" publication-format="electronic"><day>15</day><month>01</month><year>2022</year></pub-date><volume>16</volume><issue>1</issue><issue-title xml:lang="en"/><issue-title xml:lang="ru"/><fpage>64</fpage><lpage>70</lpage><history><date date-type="received" iso-8601-date="2022-03-26"><day>26</day><month>03</month><year>2022</year></date><date date-type="accepted" iso-8601-date="2022-03-26"><day>26</day><month>03</month><year>2022</year></date></history><permissions><copyright-statement xml:lang="en">Copyright ©; 2022, Shpilyukova Y.A., Fedotova E.Y., Illarioshkin S.N.</copyright-statement><copyright-statement xml:lang="ru">Copyright ©; 2022, Шпилюкова Ю.А., Федотова Е.Ю., Иллариошкин С.Н.</copyright-statement><copyright-year>2022</copyright-year><copyright-holder xml:lang="en">Shpilyukova Y.A., Fedotova E.Y., Illarioshkin S.N.</copyright-holder><copyright-holder xml:lang="ru">Шпилюкова Ю.А., Федотова Е.Ю., Иллариошкин С.Н.</copyright-holder><ali:free_to_read xmlns:ali="http://www.niso.org/schemas/ali/1.0/"/><license><ali:license_ref xmlns:ali="http://www.niso.org/schemas/ali/1.0/">https://creativecommons.org/licenses/by/4.0</ali:license_ref></license></permissions><self-uri xlink:href="https://annaly-nevrologii.com/pathID/article/view/836">https://annaly-nevrologii.com/pathID/article/view/836</self-uri><abstract xml:lang="en"><p>Corticobasal syndrome (CBS) is a variant of atypical parkinsonism. The underlying cause may be corticobasal degeneration or other proteinopathies, which can be verified only after studying specific biomarkers. The disease aetiology in CBS needs to be established to determine the disease prognosis. It can also affect the choice of pathogenetic treatment due to the differences in the molecular pathogenesis of proteinopathies that cause neurodegenerative processes. Four clinical cases of CBS are presented: in patients with four-repeat tauopathy, Alzheimer's disease, frontotemporal dementia and Creutzfeldt–Jakob disease. Examples are provided of the clinical, genetic and biochemical biomarkers available for differential diagnosis of CBS.</p></abstract><trans-abstract xml:lang="ru"><p>Кортикобазальный синдром (КБС) представляет собой вариант атипичного паркинсонизма. В его основе могут лежать как кортикобазальная дегенерация, так и другие протеинопатии, верификация которых возможна только при исследовании специфических биомаркеров. Установление нозологической принадлежности заболевания при КБС необходимо для определения прогноза заболевания и может влиять на выбор патогенетического лечения в силу различий молекулярного патогенеза протеинопатий, вызывающих нейродегенеративные процессы. Представлены 4 клинических случая КБС — у пациентов с 4R-таупатией, болезнью Альцгеймера, лобно-височной деменцией и болезнью Крейтцфельдта–Якоба. Приведены примеры использования доступных инструментальных, генетических и биохимических биомаркеров для проведения дифференциальной диагностики КБС.</p></trans-abstract><kwd-group xml:lang="en"><kwd>corticobasal syndrome</kwd><kwd>corticobasal degeneration</kwd><kwd>Creutzfeldt-Jakob disease</kwd><kwd>Alzheimer's disease</kwd><kwd>four-repeat tauopathy</kwd></kwd-group><kwd-group xml:lang="ru"><kwd>кортикобазальный синдром</kwd><kwd>кортикобазальная дегенерация</kwd><kwd>болезнь Крейтцфельдта–Якоба</kwd><kwd>болезнь Альцгеймера</kwd><kwd>4R-таупатия</kwd></kwd-group><funding-group><funding-statement xml:lang="en">This work was supported by the Russian Foundation for Basic Research (grant no. 19-015-00533).</funding-statement><funding-statement xml:lang="ru">Работа выполнена при финансовой поддержке Российского фонда фундаментальных исследований (грант № 19-015-00533).</funding-statement></funding-group></article-meta></front><body></body><back><ref-list><ref id="B1"><label>1.</label><mixed-citation>Armstrong M.J., Litvan I., Lang A.E. et al. 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