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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">avk</journal-id><journal-title-group><journal-title xml:lang="ru">Архивъ внутренней медицины</journal-title><trans-title-group xml:lang="en"><trans-title>The Russian Archives of Internal Medicine</trans-title></trans-title-group></journal-title-group><issn pub-type="ppub">2226-6704</issn><issn pub-type="epub">2411-6564</issn><publisher><publisher-name>“SINAPS” LLC</publisher-name></publisher></journal-meta><article-meta><article-id pub-id-type="doi">10.20514/2226-6704-2024-14-5-370-380</article-id><article-id custom-type="edn" pub-id-type="custom">NBZCES</article-id><article-id custom-type="elpub" pub-id-type="custom">avk-1853</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>РАЗБОР КЛИНИЧЕСКИХ СЛУЧАЕВ</subject></subj-group><subj-group subj-group-type="section-heading" xml:lang="en"><subject>ANALYSIS OF CLINICAL CASES</subject></subj-group></article-categories><title-group><article-title>Трудности диагностики пациента с лихорадкой неясного генеза</article-title><trans-title-group xml:lang="en"><trans-title>Difficulties in Diagnosing a Patient with Fever of Unknown Origin</trans-title></trans-title-group></title-group><contrib-group><contrib contrib-type="author" corresp="yes"><contrib-id contrib-id-type="orcid">https://orcid.org/0009-0005-9986-243X</contrib-id><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Фомина</surname><given-names>Е. И.</given-names></name><name name-style="western" xml:lang="en"><surname>Fomina</surname><given-names>E. I.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Фомина Елизавета Игоревна — ординатор кафедры терапиии профилактической медицины</p><p>Москва</p></bio><bio xml:lang="en"><p>Elizaveta I. Fomina — Resident of the Department</p><p>Moscow</p></bio><email xlink:type="simple">fomina.elizaveta.i@gmail.com</email><xref ref-type="aff" rid="aff-1"/></contrib><contrib contrib-type="author" corresp="yes"><contrib-id contrib-id-type="orcid">https://orcid.org/0009-0009-4149-9497</contrib-id><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Губернаторова</surname><given-names>Е. Е.</given-names></name><name name-style="western" xml:lang="en"><surname>Gubernatorova</surname><given-names>E. E.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Губернаторова Екатерина Евгеньевна — к.м.н., ассистент кафедры</p><p>Москва</p></bio><bio xml:lang="en"><p>Ekaterina E. Gubernatorova — Candidate of Medical Sciences, Assistant of the Department</p><p>Moscow</p></bio><email xlink:type="simple">creativeone@list.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/0000-0002-3763-8994</contrib-id><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Адашева</surname><given-names>Т. В.</given-names></name><name name-style="western" xml:lang="en"><surname>Adasheva</surname><given-names>T. V.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Адашева Татьяна Владимировна — д.м.н., профессор кафедры</p><p>Москва</p></bio><bio xml:lang="en"><p>Tatyana V. Adasheva — Doctor of Medical Sciences, Professor of the Department</p><p>Moscow</p></bio><email xlink:type="simple">adashtv@mail.ru</email><xref ref-type="aff" rid="aff-1"/></contrib><contrib contrib-type="author" corresp="yes"><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Батурина</surname><given-names>Т. В.</given-names></name><name name-style="western" xml:lang="en"><surname>Baturina</surname><given-names>T. V.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Батурина Татьяна Викторовна — Старший преподаватель кафедры внутренних болезней</p><p>Москва</p></bio><bio xml:lang="en"><p>Tatyana V. Adasheva — Doctor of Medical Sciences, Professor of the Department</p><p>Moscow</p></bio><email xlink:type="simple">4961036@mail.ru</email><xref ref-type="aff" rid="aff-2"/></contrib><contrib contrib-type="author" corresp="yes"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0002-8170-0863</contrib-id><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Саможенова</surname><given-names>П. С.</given-names></name><name name-style="western" xml:lang="en"><surname>Samoszhenova</surname><given-names>P. S.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Саможенова Полина Сергеевна — ординатор кафедры</p><p>Москва</p></bio><bio xml:lang="en"><p>Polina S. Samozhenova — resident of the Department</p><p>Moscow</p></bio><email xlink:type="simple">samozhenowapolina@gmail.com</email><xref ref-type="aff" rid="aff-1"/></contrib><contrib contrib-type="author" corresp="yes"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0002-9315-9533</contrib-id><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Тимофеева</surname><given-names>Н. Ю.</given-names></name><name name-style="western" xml:lang="en"><surname>Timofeeva</surname><given-names>N. U.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Тимофеева Наталья Юрьевна — к.м.н., доцент кафедры </p><p>Москва</p></bio><bio xml:lang="en"><p>Natalya Yu. Timofeeva — Candidate of Medical Sciences, Associate Professor of the Department </p><p>Moscow</p></bio><xref ref-type="aff" rid="aff-1"/></contrib></contrib-group><aff-alternatives id="aff-1"><aff xml:lang="ru"><institution>Федеральное государственное бюджетное образовательное учреждение высшего образования «Российский университет медицины» Министерства здравоохранения Российской Федерации, кафедра терапии и профилактической медицины</institution><country>Россия</country></aff><aff xml:lang="en"><institution>Federal Budgetary Educational Institution of Higher Education «Russian university of Medicine» of the Ministry of Healthcare of the Russian Federation, Department of Therapy and Preventive Medicine</institution><country>Russian Federation</country></aff></aff-alternatives><aff-alternatives id="aff-2"><aff xml:lang="ru"><institution>Частное учреждение образовательная организация высшего образования «Медицинский университет «Реавиз», кафедра внутренних болезней</institution><country>Россия</country></aff><aff xml:lang="en"><institution>Private institution of higher education educational organization Medical University REAVIZ, Department of Internal Medicine</institution><country>Russian Federation</country></aff></aff-alternatives><pub-date pub-type="collection"><year>2024</year></pub-date><pub-date pub-type="epub"><day>14</day><month>10</month><year>2024</year></pub-date><volume>14</volume><issue>5</issue><fpage>370</fpage><lpage>380</lpage><permissions><copyright-statement>Copyright &amp;#x00A9; Фомина Е.И., Губернаторова Е.Е., Адашева Т.В., Батурина Т.В., Саможенова П.С., Тимофеева Н.Ю., 2024</copyright-statement><copyright-year>2024</copyright-year><copyright-holder xml:lang="ru">Фомина Е.И., Губернаторова Е.Е., Адашева Т.В., Батурина Т.В., Саможенова П.С., Тимофеева Н.Ю.</copyright-holder><copyright-holder xml:lang="en">Fomina E.I., Gubernatorova E.E., Adasheva T.V., Baturina T.V., Samoszhenova P.S., Timofeeva N.U.</copyright-holder><license xml:lang="ru" license-type="creative-commons-attribution" xlink:href="https://creativecommons.org/licenses/by/4.0/" xlink:type="simple"><license-p>Данная работа распространяется под лицензией Creative Commons Attribution 4.0.</license-p></license><license xml:lang="en" 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.medarhive.ru/jour/article/view/1853">https://www.medarhive.ru/jour/article/view/1853</self-uri><abstract><p>Лихорадка неясного генеза представляет собой сложный для дифференциальной диагностики синдром. При отсутствии ключевого признака, который мог бы указать на причину состояния дальнейший диагностический поиск становится затруднительным. Осложняет диагностику многообразие причин и отсутствие единого алгоритма обследования. В представленном клиническом случае описывается пациентка 53 лет, с длительной лихорадкой более 1.5 месяцев, болевым синдромом в области лица. При амбулаторном наблюдении причина выяснена не была. На стационарном этапе проведено комплексное обследование по всем классам причин. Выявленные изменения щитовидной железы и наличие тиреотоксикоза позволили поставить диагноз подострого тиреоидита. Согласно данным литературы, подострый тиреоидит является одной из редких причин лихорадки неясного генеза. Назначение глюкокортикостероидов позволило достигнуть полного регресса клинических симптомов к 4 суткам. Через 5 месяцев достигнут субклинический гипотиреоз. Нозологический подход и междисциплинарное взаимодействие способствовали верной тактике и благоприятному исходу заболевания.</p></abstract><trans-abstract xml:lang="en"><p>Fever of unknown origin is a difficult syndrome for differential diagnosis. Absence of a key feature, variety of causes and the lack of single examination algorithm makes difficult further diagnosis. The presented clinical case describes a 53-year-old patient with a prolonged fever of more than 1.5 months, pain syndrome in the facial area. During outpatient monitoring, the cause was not clarified. At the inpatient stage, a comprehensive examination was conducted for all classes of causes. The revealed changes in the thyroid gland and thyrotoxicosis made it possible to diagnose subacute thyroiditis. According to the literature, subacute thyroiditis is one of the rare causes of fever of unknown origin. Prescription of glucocorticosteroid made it possible to achieve complete regression of clinical symptoms in 4 days. After 5 months, subclinical hypothyroidism was achieved. The nosological approach and multidisciplinary interaction contributed to the correct tactics and a favorable outcome of the disease.</p></trans-abstract><kwd-group xml:lang="ru"><kwd>лихорадка неясного генеза</kwd><kwd>подострый тиреоидит</kwd></kwd-group><kwd-group xml:lang="en"><kwd>fever of unknown origin</kwd><kwd>subacute thyroiditis</kwd></kwd-group><funding-group><funding-statement xml:lang="ru">Авторы заявляют об отсутствии финансирования при проведении исследования</funding-statement><funding-statement xml:lang="en">The authors declare no funding for this study</funding-statement></funding-group></article-meta></front><back><ref-list><title>References</title><ref id="cit1"><label>1</label><citation-alternatives><mixed-citation xml:lang="ru">Petersdorf RG, Beeson PB. Fever of unexplained origin: report on 100 cases. 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