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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">983</article-id><article-id pub-id-type="doi">10.17816/ACEN.983</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">Complication of COVID-19: Mild Encephalopathy Syndrome with Reversible Splenial Lesion</article-title><trans-title-group xml:lang="ru"><trans-title>Осложнение коронавирусной инфекции: cиндром умеренной энцефалопатии с обратимым поражением валика мозолистого тела</trans-title></trans-title-group></title-group><contrib-group><contrib contrib-type="author"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0002-1889-0094</contrib-id><name-alternatives><name xml:lang="en"><surname>Matveeva</surname><given-names>Tatiana V.</given-names></name><name xml:lang="ru"><surname>Матвеева</surname><given-names>Татьяна Всеволодовна</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><bio xml:lang="en"><p>Dr. Sci. (Med.), Prof., Department of neurology, neurosurgery and medical genetics</p></bio><bio xml:lang="ru"><p>д-р мед. наук, профессор каф. неврологии, нейрохирургии и медицинской генетики</p></bio><email>gaifutdinov69@mail.ru</email><xref ref-type="aff" rid="aff1"/></contrib><contrib contrib-type="author"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0001-5591-7148</contrib-id><name-alternatives><name xml:lang="en"><surname>Gaifutdinov</surname><given-names>Rustem T.</given-names></name><name xml:lang="ru"><surname>Гайфутдинов</surname><given-names>Рустем Талгатович</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><bio xml:lang="en"><p>Cand. Sci. (Med.), Associate Professor, Department of neurology, neurosurgery and medical genetics</p></bio><bio xml:lang="ru"><p>канд. мед. наук, доцент каф. неврологии, нейрохирургии и медицинской генетики</p></bio><email>gaifutdinov69@mail.ru</email><xref ref-type="aff" rid="aff1"/></contrib><contrib contrib-type="author"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0002-3123-9546</contrib-id><name-alternatives><name xml:lang="en"><surname>Kamalova</surname><given-names>Dinara S.</given-names></name><name xml:lang="ru"><surname>Камалова</surname><given-names>Динара Шамилевна</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><bio xml:lang="en"><p>neurologist, Central City Clinical Hospital No. 18</p></bio><bio xml:lang="ru"><p>врач-невролог ЦГКБ № 18</p></bio><email>gaifutdinov69@mail.ru</email><xref ref-type="aff" rid="aff1"/></contrib><contrib contrib-type="author"><contrib-id contrib-id-type="orcid">https://orcid.org/0009-0004-4843-6767</contrib-id><name-alternatives><name xml:lang="en"><surname>Fasakhova</surname><given-names>Gulnaz A.</given-names></name><name xml:lang="ru"><surname>Фасахова</surname><given-names>Гульназ Ануровна</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><bio xml:lang="en"><p>Head, Neurology department</p></bio><bio xml:lang="ru"><p>зав. неврологическим отделением</p></bio><email>gaifutdinov69@mail.ru</email><xref ref-type="aff" rid="aff2"/></contrib></contrib-group><aff-alternatives id="aff1"><aff><institution xml:lang="en">Kazan State Medical University</institution></aff><aff><institution xml:lang="ru">Казанский государственный медицинский университет</institution></aff></aff-alternatives><aff-alternatives id="aff2"><aff><institution xml:lang="en">Central City Clinical Hospital No. 18</institution></aff><aff><institution xml:lang="ru">Центральная городская клиническая больница № 18</institution></aff></aff-alternatives><pub-date date-type="pub" iso-8601-date="2024-12-06" publication-format="electronic"><day>06</day><month>12</month><year>2024</year></pub-date><volume>18</volume><issue>4</issue><issue-title xml:lang="en"/><issue-title xml:lang="ru"/><fpage>110</fpage><lpage>116</lpage><history><date date-type="received" iso-8601-date="2023-04-28"><day>28</day><month>04</month><year>2023</year></date><date date-type="accepted" iso-8601-date="2023-07-29"><day>29</day><month>07</month><year>2023</year></date></history><permissions><copyright-statement xml:lang="en">Copyright ©; 2024, Matveeva T.V., Gaifutdinov R.T., Kamalova D.S., Fasakhova G.A.</copyright-statement><copyright-statement xml:lang="ru">Copyright ©; 2024, Матвеева Т.В., Гайфутдинов Р.Т., Камалова Д.Ш., Фасахова Г.А.</copyright-statement><copyright-year>2024</copyright-year><copyright-holder xml:lang="en">Matveeva T.V., Gaifutdinov R.T., Kamalova D.S., Fasakhova G.A.</copyright-holder><copyright-holder xml:lang="ru">Матвеева Т.В., Гайфутдинов Р.Т., Камалова Д.Ш., Фасахова Г.А.</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/983">https://annaly-nevrologii.com/pathID/article/view/983</self-uri><abstract xml:lang="en"><p>A syndrome of mild encephalopathy with reversible splenial lesion (MERS) was described in a post-COVID-19 male patient. The clinical manifestations included neuropsychiatric and visual abnormalities; when focusing separately on an object (one eye closed), the left eye perceived it as normal, but the right eye perceived it as multiple images moving diagonally into the distance. T2, FLAIR, and ADC magnetic resonance imaging (MRI) showed a splenial lesion that resolved rapidly without using corticosteroids. The patient was diagnosed with cerebral polyopia because he saw images arranged in ordered rows after focusing on an object. Differential diagnoses included astigmatism, palinopsia, and polyopic visual hallucinations. Monocular polyopia is explained by anomia associated with the patient's partial split-brain syndrome (the splenial lesion, neuropsychiatric abnormalities); involvement of the pathways from the frontal eye fields to the brainstem structures responsible for initiating extraocular eye movements. The association of neurological complications with prior COVID-19, rapid resolution of symptoms, and MRI lesions without initiating immunosuppressive therapy suggested endotheliopathy as the cause of COVID-19 complications.</p></abstract><trans-abstract xml:lang="ru"><p>Описан синдром умеренной энцефалопатии с обратимым поражением валика мозолистого тела у мужчины, перенёсшего COVID-19. Клиническими проявлениями заболевания были нейропсихические отклонения и нарушение зрения — при раздельной фокусировке взора на объекте (один глаз закрыт) левый глаз воспринимал его как обычно, правый — как множество уходящих вдаль по диагонали изображений. На магнитно-резонансной томограмме (МРТ) в режимах Т2, FLAIR, АDС зафиксировано быстро регрессирующее без назначения глюкокортикоидов образование в валике мозолистого тела. Видение пациентом изображений в виде упорядоченных рядов после фиксации взора на объекте позволило диагностировать у него церебральную полиопию. Дифференциальный диагноз проводился с астигматизмом, палинопсией, зрительными полиопическими галлюцинациями. Моноокулярная полиопия объяснена аномией, сопряжённой с имеющимся у пациента синдромом частично «расщеплённого мозга» (очаг в валике мозолистого тела, нейропсихические отклонения); заинтересованностью путей от лобных полей глаза к структурам ствола, ответственных за инициацию экстраокулярных движений глаз. Ассоциация неврологических осложнений с перенесённым COVID-19, быстрый регресс симптомов заболевания и изменений на МРТ без назначения иммуносупрессивной терапии позволило в качестве генеза осложнения COVID-19 предположить эндотелиопатию.</p></trans-abstract><kwd-group xml:lang="en"><kwd>splenium of the corpus callosum</kwd><kwd>MERS</kwd><kwd>polyopia</kwd><kwd>split-brain syndrome</kwd><kwd>anomia</kwd></kwd-group><kwd-group xml:lang="ru"><kwd>валик мозолистого тела</kwd><kwd>синдром MERS</kwd><kwd>полиопия</kwd><kwd>синдром «расщеплённого мозга»</kwd><kwd>аномия</kwd></kwd-group><funding-group/></article-meta></front><body></body><back><ref-list><ref id="B1"><label>1.</label><mixed-citation>Белопасов В.В., Яшу Я., Самойлова Е.М., Баклаушев В.П. Поражение нервной системы при СOVID-19. Клиническая практика. 2020;11(2):60–80. Belopasov V.V., Yashu Ya.A., Samojlova E.M., Baklaushev V.P. Damage to the nervous system in COVID-19. Clinical practice. 2020;11(2):60–80. 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