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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="other" dtd-version="1.2" xml:lang="en"><front><journal-meta><journal-id journal-id-type="publisher-id">Oncohematology</journal-id><journal-title-group><journal-title xml:lang="en">Oncohematology</journal-title><trans-title-group xml:lang="ru"><trans-title>Онкогематология</trans-title></trans-title-group></journal-title-group><issn publication-format="print">1818-8346</issn><issn publication-format="electronic">2413-4023</issn><publisher><publisher-name xml:lang="en">Publishing House ABV Press</publisher-name></publisher></journal-meta><article-meta><article-id pub-id-type="publisher-id">1051</article-id><article-id pub-id-type="doi">10.17650/1818-8346-2025-20-3-47-51</article-id><article-categories><subj-group subj-group-type="toc-heading" xml:lang="en"><subject>RARE AND COMPLEX CLINICAL SITUATIONS</subject></subj-group><subj-group subj-group-type="toc-heading" xml:lang="ru"><subject>РЕДКИЕ И СЛОЖНЫЕ КЛИНИЧЕСКИЕ СИТУАЦИИ</subject></subj-group><subj-group subj-group-type="article-type"><subject></subject></subj-group></article-categories><title-group><article-title xml:lang="en">Differential diagnostic search for hypereosinophilic syndrome</article-title><trans-title-group xml:lang="ru"><trans-title>Дифференциально-диагностический поиск при гиперэозинофильном синдроме</trans-title></trans-title-group></title-group><contrib-group><contrib contrib-type="author"><contrib-id contrib-id-type="orcid">https://orcid.org/0009-0009-8831-5675</contrib-id><name-alternatives><name xml:lang="en"><surname>Buzuk</surname><given-names>A. S.</given-names></name><name xml:lang="ru"><surname>Бузук</surname><given-names>А. С.</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><bio xml:lang="en"><p>2 Kostyushko St., Saint Petersburg 196247</p></bio><bio xml:lang="ru"><p>Александра Сергеевна Бузук</p><p>196247 Санкт-Петербург, ул. Костюшко, 2</p></bio><email>buzuk.sasha1105@gmail.com</email><xref ref-type="aff" rid="aff1"/></contrib><contrib contrib-type="author"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0002-3791-4506</contrib-id><name-alternatives><name xml:lang="en"><surname>Chernova</surname><given-names>E. V.</given-names></name><name xml:lang="ru"><surname>Чернова</surname><given-names>Е. В.</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><bio xml:lang="en"><p>2 Kostyushko St., Saint Petersburg 196247</p></bio><bio xml:lang="ru"><p>196247 Санкт-Петербург, ул. Костюшко, 2</p></bio><xref ref-type="aff" rid="aff1"/></contrib><contrib contrib-type="author"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0002-5249-4255</contrib-id><name-alternatives><name xml:lang="en"><surname>Koloskov</surname><given-names>A. V.</given-names></name><name xml:lang="ru"><surname>Колосков</surname><given-names>А. В.</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><bio xml:lang="en"><p>Kostyushko St., Saint Petersburg 196247</p></bio><bio xml:lang="ru"><p>196247 Санкт-Петербург, ул. Костюшко, 2</p></bio><xref ref-type="aff" rid="aff1"/></contrib><contrib contrib-type="author"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0002-2440-7222</contrib-id><name-alternatives><name xml:lang="en"><surname>Marchenko</surname><given-names>V. N.</given-names></name><name xml:lang="ru"><surname>Марченко</surname><given-names>В. Н.</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><bio xml:lang="en"><p>6–8 L’va Tolstogo St., Saint Petersburg 197022</p></bio><bio xml:lang="ru"><p>197022 Санкт-Петербург, ул. Льва Толстого, 6–8</p></bio><xref ref-type="aff" rid="aff2"/></contrib></contrib-group><aff-alternatives id="aff1"><aff><institution xml:lang="en">City Hospital No. 26</institution></aff><aff><institution xml:lang="ru">СПб ГБУЗ «Городская больница № 26»</institution></aff></aff-alternatives><aff-alternatives id="aff2"><aff><institution xml:lang="en">I.P. Pavlov First Saint Petersburg State Medical University, Ministry of Health of Russia</institution></aff><aff><institution xml:lang="ru">ФГБОУ ВО «Первый Санкт-Петербургский государственный медицинский университет им. акад. И. П. Павлова» Минздрава России</institution></aff></aff-alternatives><pub-date date-type="pub" iso-8601-date="2025-09-11" publication-format="electronic"><day>11</day><month>09</month><year>2025</year></pub-date><volume>20</volume><issue>3</issue><issue-title xml:lang="en"/><issue-title xml:lang="ru"/><fpage>47</fpage><lpage>51</lpage><history><date date-type="received" iso-8601-date="2025-09-10"><day>10</day><month>09</month><year>2025</year></date><date date-type="accepted" iso-8601-date="2025-09-10"><day>10</day><month>09</month><year>2025</year></date></history><permissions><ali:free_to_read xmlns:ali="http://www.niso.org/schemas/ali/1.0/"/></permissions><self-uri xlink:href="https://oncohematology.abvpress.ru/ongm/article/view/1051">https://oncohematology.abvpress.ru/ongm/article/view/1051</self-uri><abstract xml:lang="en"><p>Idiopathic hypereosinophilic syndrome is characterized by a persistent increase in serum eosinophil counts &gt;1.5 × 109 / L for 4 weeks and the absence of any clinical, laboratory and instrumental data suggesting the etiology of this phenomenon. It is not always possible to confirm the reactive nature of eosinophilia or identify clonal disease. The article presents a clinical case of differential diagnostic search for the cause of hypereosinophilia in a patient.</p></abstract><trans-abstract xml:lang="ru"><p>Идиопатический гиперэозинофильный синдром характеризуется стойким повышением количества эозинофилов в сыворотке крови &gt;1,5 × 109 / л в течение 4 нед и отсутствием каких‑либо клинических и лабораторно-инструментальных данных, позволяющих предположить этиологию данного феномена. Не всегда удается подтвердить реактивный характер эозинофилии или выявить клональное заболевание.В статье представлен клинический случай дифференциально-диагностического поиска причины гипероэзинофилии у пациента.</p></trans-abstract><kwd-group xml:lang="en"><kwd>hypereosinophilic syndrome</kwd><kwd>clonal eosinophilia</kwd><kwd>molecular genetic study</kwd><kwd>reactive eosinophilia</kwd></kwd-group><kwd-group xml:lang="ru"><kwd>гиперэозинофильный синдром</kwd><kwd>клональная эозинофилия</kwd><kwd>молекулярно-генетическое исследование</kwd><kwd>реактивная эозинофилия</kwd></kwd-group><funding-group/></article-meta></front><body></body><back><ref-list><ref id="B1"><label>1.</label><mixed-citation>Kanuru S., Sapra A. Eosinophilia. 2023. In: StatPearls [Internet]. Treasure Island (FL): StatPearls Publishing; 2025 Jan–.</mixed-citation></ref><ref id="B2"><label>2.</label><citation-alternatives><mixed-citation xml:lang="en">Kovrigina A.M., Melikyan A.I., Nemchenko I.S. et al. 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