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<article article-type="research-article" dtd-version="1.3" 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" xml:lang="ru"><front><journal-meta><journal-id journal-id-type="publisher-id">r-n-j</journal-id><journal-title-group><journal-title xml:lang="ru">Российский неврологический журнал</journal-title><trans-title-group xml:lang="en"><trans-title>Russian neurological journal</trans-title></trans-title-group></journal-title-group><issn pub-type="ppub">2658-7947</issn><issn pub-type="epub">2686-7192</issn><publisher><publisher-name>МИА</publisher-name></publisher></journal-meta><article-meta><article-id pub-id-type="doi">10.30629/2658-7947-2022-27-1-88-93</article-id><article-id custom-type="elpub" pub-id-type="custom">r-n-j-270</article-id><article-categories><subj-group subj-group-type="heading"><subject>Research Article</subject></subj-group><subj-group subj-group-type="section-heading" xml:lang="ru"><subject>ИССЛЕДОВАНИЯ И КЛИНИЧЕСКИЕ НАБЛЮДЕНИЯ</subject></subj-group><subj-group subj-group-type="section-heading" xml:lang="en"><subject>CLINICAL RESEARCHES AND CASE REPORTS</subject></subj-group></article-categories><title-group><article-title>Трудности дифференциальной диагностики хронического клещевого энцефалита и прогрессирующего надъядерного паралича</article-title><trans-title-group xml:lang="en"><trans-title>Difficulties in differential diagnosis of chronic tick-borne encephalitis and progressive supranuclear palsy</trans-title></trans-title-group></title-group><contrib-group><contrib contrib-type="author" corresp="yes"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0003-3179-7668</contrib-id><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Нужный</surname><given-names>Е. П.</given-names></name><name name-style="western" xml:lang="en"><surname>Nuzhnyi</surname><given-names>E. P.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Нужный Евгений Петрович — к.м.н., врач-невролог 5-го неврологического отделения</p><p>Москва</p></bio><bio xml:lang="en"><p>Nuzhnyi Evgenii Petrovich — PhD, Neurologist of Department of Neurogenetics</p><p>Moscow</p></bio><email xlink:type="simple">enuzhny@mail.ru</email><xref ref-type="aff" rid="aff-1"/></contrib><contrib contrib-type="author" corresp="yes"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0001-8070-7644</contrib-id><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Федотова</surname><given-names>Е. Ю.</given-names></name><name name-style="western" xml:lang="en"><surname>Fedotova</surname><given-names>E. Yu.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Москва</p></bio><bio xml:lang="en"><p>Moscow</p></bio><xref ref-type="aff" rid="aff-1"/></contrib><contrib contrib-type="author" corresp="yes"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0003-3843-6435</contrib-id><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Москаленко</surname><given-names>А. Н.</given-names></name><name name-style="western" xml:lang="en"><surname>Moskalenko</surname><given-names>A. N.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Москва</p></bio><bio xml:lang="en"><p>Moscow</p></bio><xref ref-type="aff" rid="aff-1"/></contrib><contrib contrib-type="author" corresp="yes"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0002-2704-6282</contrib-id><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Иллариошкин</surname><given-names>С. Н.</given-names></name><name name-style="western" xml:lang="en"><surname>Illarioshkin</surname><given-names>S. N.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Москва</p></bio><bio xml:lang="en"><p>Moscow</p></bio><xref ref-type="aff" rid="aff-1"/></contrib></contrib-group><aff-alternatives id="aff-1"><aff xml:lang="ru">Федеральное государственное бюджетное научное учреждение «Научный центр неврологии»<country>Россия</country></aff><aff xml:lang="en">Research Center of Neurology<country>Russian Federation</country></aff></aff-alternatives><pub-date pub-type="collection"><year>2022</year></pub-date><pub-date pub-type="epub"><day>07</day><month>03</month><year>2022</year></pub-date><volume>27</volume><issue>1</issue><fpage>88</fpage><lpage>93</lpage><permissions><copyright-statement>Copyright &amp;#x00A9; Нужный Е.П., Федотова Е.Ю., Москаленко А.Н., Иллариошкин С.Н., 2022</copyright-statement><copyright-year>2022</copyright-year><copyright-holder xml:lang="ru">Нужный Е.П., Федотова Е.Ю., Москаленко А.Н., Иллариошкин С.Н.</copyright-holder><copyright-holder xml:lang="en">Nuzhnyi E.P., Fedotova E.Y., Moskalenko A.N., Illarioshkin S.N.</copyright-holder><license license-type="creative-commons-attribution" xlink:href="https://creativecommons.org/licenses/by/4.0/" xlink:type="simple"><license-p>This work is licensed under a Creative Commons Attribution 4.0 License.</license-p></license></permissions><self-uri xlink:href="https://www.r-n-j.com/jour/article/view/270">https://www.r-n-j.com/jour/article/view/270</self-uri><abstract><p>В статье представлены два клинических наблюдения пациентов 51 и 57 лет, проживающих в эндемичных по клещевому энцефалиту регионах, у которых дифференциальный диагноз между прогрессирующим надъядерным параличем (ПНП) и крайне редким паркинсоническим вариантом хронического клещевого энцефалита (ХКЭ) вызвал ряд трудностей. В обоих случаях наблюдалась клиническая картина прогрессирующего симметричного леводопа-резистентного паркинсонизма с вертикальным парезом взора, нарушением когнитивных управляющих функций, симптомами поражения лобных долей, фокальной дистонией; в одном случае — раннее появление постуральных нарушений, что соответствует диагнозу «вероятный ПНП». В пользу паркинсонического варианта ХКЭ свидетельствовали отсутствие негативизации антител IgG к вирусу клещевого энцефалита в крови в течение нескольких лет, интратекальный олигоклональный синтез антител у одной пациентки, отсутствие типичных нейровизуализационных признаков ПНП, отсроченный дебют заболевания после укуса клеща. Обсуждаются трудности диагностики и возможные механизмы патогенеза первично-прогредиентного ХКЭ, а также схожесть клинической и патоморфологической картины ПНП, летаргического энцефалита Экономо и постэнцефалитического паркинсонизма.</p></abstract><trans-abstract xml:lang="en"><p>The article presents two clinical cases of 51 and 57-year-old patients living in regions endemic for tick-borne encephalitis in which the differential diagnosis between progressive supranuclear palsy (PSP) and the extremely rare parkinsonian variant of chronic tick-borne encephalitis (CTBE) resulted in a diagnostic challenge. In both cases there was a clinical presentation of progressive symmetric levodopa-resistant parkinsonism with vertical gaze palsy, cognitive impairment of the executive type, frontal lobe signs, focal dystonia and in one case — early onset of postural instability, which corresponds to the diagnosis of probable PSP. The parkinsonian variant of CTBE was supported by the lack of tick-borne encephalitis virus IgG-antibodies negativity in the blood for several years, intrathecal oligoclonal antibody synthesis in one patient, the absence of typical neuroimaging signs of PSP, and delayed disease onset after a tick bite. Difficulties in diagnosis and possible mechanisms of the pathogenesis of primary progressive CTBE, as well as the similarity of the clinical and pathomorphological presentation of PSP, von Economo encephalitis lethargica, and postencephalitic parkinsonism are discussed.</p></trans-abstract><kwd-group xml:lang="ru"><kwd>хронический клещевой энцефалит</kwd><kwd>прогрессирующий надъядерный паралич</kwd><kwd>паркинсонизм</kwd><kwd>дифференциальная диагностика</kwd><kwd>клиническая картина</kwd></kwd-group><kwd-group xml:lang="en"><kwd>chronic tick-born encephalitis</kwd><kwd>progressive supranuclear palsy</kwd><kwd>parkinsonism</kwd><kwd>differential diagnosis</kwd><kwd>clinical presentation</kwd></kwd-group></article-meta></front><back><ref-list><title>References</title><ref id="cit1"><label>1</label><citation-alternatives><mixed-citation xml:lang="ru">Höglinger G.U., Respondek G., Stamelou M., Kurz C., Josephs K.A., Lang A.E. et al.; Movement Disorder Society-endorsed PSP Study Group. 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