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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">clinicaloncology</journal-id><journal-title-group><journal-title xml:lang="ru">Клинический случай в онкологии</journal-title><trans-title-group xml:lang="en"><trans-title>Clinical Case in Oncology</trans-title></trans-title-group></journal-title-group><issn pub-type="ppub">3034-1477</issn><issn pub-type="epub">3034-4018</issn><publisher><publisher-name>ОНКОПРАКТИК</publisher-name></publisher></journal-meta><article-meta><article-id pub-id-type="doi">10.62546/3034-1477-2026-4-1-51-56</article-id><article-id custom-type="elpub" pub-id-type="custom">clinicaloncology-157</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>КЛИНИЧЕСКИЙ СЛУЧАЙ</subject></subj-group><subj-group subj-group-type="section-heading" xml:lang="en"><subject>CLINICAL CASE</subject></subj-group></article-categories><title-group><article-title>Клинический случай метастазирования колоректального рака в антральный отдел желудка</article-title><trans-title-group xml:lang="en"><trans-title>A clinical case of colorectal cancer metastasis to the gastric antrum</trans-title></trans-title-group></title-group><contrib-group><contrib contrib-type="author" corresp="yes"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0003-0326-2957</contrib-id><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Свечкова</surname><given-names>А. А.</given-names></name><name name-style="western" xml:lang="en"><surname>Svechkova</surname><given-names>А. А.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Свечкова Анна Алексеевна </p><p>Санкт-Петербург</p></bio><xref ref-type="aff" rid="aff-1"/></contrib><contrib contrib-type="author" corresp="yes"><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Данилина</surname><given-names>Д. М.</given-names></name><name name-style="western" xml:lang="en"><surname>Danilina</surname><given-names>D. M.</given-names></name></name-alternatives><bio xml:lang="ru"><p> </p><p>Санкт-Петербург</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/0000-0003-4191-723X</contrib-id><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Хамид</surname><given-names>А. Х.</given-names></name><name name-style="western" xml:lang="en"><surname>Khamid</surname><given-names>A. H.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Хамид Абдо Хейрреддин</p><p>Санкт-Петербург</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/0009-0008-6005-9617</contrib-id><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Котова</surname><given-names>К. П.</given-names></name><name name-style="western" xml:lang="en"><surname>Kotova</surname><given-names>K. P.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Котова Ксения Павловна </p><p>Санкт-Петербург</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/0009-0007-0329-9625</contrib-id><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Лебедев</surname><given-names>К. С.</given-names></name><name name-style="western" xml:lang="en"><surname>Lebedev</surname><given-names>K. S.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Лебедев Кирилл Сергеевич</p><p>Санкт-Петербург</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/0009-0009-5262-4089</contrib-id><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Суркова</surname><given-names>Ю. С.</given-names></name><name name-style="western" xml:lang="en"><surname>Surkova</surname><given-names>Yu. S.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Суркова Юлия Сергеевна</p><p>Санкт-Петербург</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/0000-0002-8514-5377</contrib-id><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Захаренко</surname><given-names>А. А.</given-names></name><name name-style="western" xml:lang="en"><surname>Zakharenko</surname><given-names>A. A.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Захаренко Александр Анатольевич</p><p>Санкт-Петербург</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 «Первый Санкт-Петербургский государственный медицинский университет имени академика И. П. Павлова» Министерства здравоохранения Российской Федерации</institution><country>Россия</country></aff><aff xml:lang="en"><institution>First Pavlov State Medical University of St. Petersburg</institution><country>Russian Federation</country></aff></aff-alternatives><pub-date pub-type="collection"><year>2026</year></pub-date><pub-date pub-type="epub"><day>12</day><month>10</month><year>2026</year></pub-date><volume>4</volume><issue>1</issue><fpage>51</fpage><lpage>56</lpage><permissions><copyright-statement>Copyright &amp;#x00A9; Свечкова А.А., Данилина Д.М., Хамид А.Х., Котова К.П., Лебедев К.С., Суркова Ю.С., Захаренко А.А., 2026</copyright-statement><copyright-year>2026</copyright-year><copyright-holder xml:lang="ru">Свечкова А.А., Данилина Д.М., Хамид А.Х., Котова К.П., Лебедев К.С., Суркова Ю.С., Захаренко А.А.</copyright-holder><copyright-holder xml:lang="en">Svechkova А.А., Danilina D.M., Khamid A.H., Kotova K.P., Lebedev K.S., Surkova Y.S., Zakharenko A.A.</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.oncocase.ru/jour/article/view/157">https://www.oncocase.ru/jour/article/view/157</self-uri><abstract><sec><title>Актуальность</title><p>Актуальность. Метастазирование колоректального рака (КРР) в желудок является крайне редким клиническим событием, что создает значительные диагностические трудности и обусловливает актуальность каждого такого наблюдения.</p></sec><sec><title>Цель</title><p>Цель. Демонстрация редкой локализации метастаза КРР в антральный отдел желудка и анализ трудностей дифференциальной диагностики с гастроинтестинальной стромальной опухолью (ГИСО) по данным лучевых и эндоскопических методов исследования.</p></sec><sec><title>Описание случая</title><p>Описание случая. Уникальность представленного случая заключается в метастатическом поражении антрального отдела желудка, имитировавшем первичную мезенхимальную опухоль (ГИСО), при отсутствии роста сывороточных онкомаркеров и других отдаленных метастазов. Благодаря своевременному эндоскопическому исследованию, радикальному хирургическому лечению и иммуногистохимическому анализу операционного материала была подтверждена колоректальная природа метастаза (экспрессия CDX2).</p></sec><sec><title>Заключение</title><p>Заключение. Данный случай демонстрирует эффективность мультидисциплинарного подхода и важность включения метастатического поражения в дифференциально-диагностический поиск при объемных образованиях желудка у пациентов с онкологическим анамнезом, даже спустя длительное время после лечения первичной опухоли.</p></sec></abstract><trans-abstract xml:lang="en"><p>Background. Metastasis of colorectal cancer (CRC) to the stomach is an extremely rare clinical event, creating significant diagnostic challenges and making each such observation relevant.Objective. To demonstrate the rare localization of colorectal cancer metastasis to the gastric antrum and to analyze the difficulties of differential diagnosis with gastrointestinal stromal tumor (GIST) using imaging and endoscopic examination methods.Case description. The uniqueness of this case lies in the metastatic lesion in the gastric antrum, mimicking a primary mesenchymal tumor (GIST), in the absence of an increase in serum tumor markers and other distant metastases. Thanks to a timely endoscopic examination, radical surgical treatment, and immunohistochemical analysis of the surgical specimen, the colorectal nature of the metastasis (CDX2 expression) was confirmed. Conclusion. This case demonstrates the effectiveness of a multidisciplinary approach and the importance of including metastatic lesions in the differential diagnosis of gastric masses in patients with a history of cancer, even long after treatment of the primary tumor.</p></trans-abstract><kwd-group xml:lang="ru"><kwd>колоректальный рак</kwd><kwd>метастаз в желудок</kwd><kwd>подслизистое образование желудка</kwd><kwd>ГИСО</kwd><kwd>иммуногистохимия</kwd></kwd-group><kwd-group xml:lang="en"><kwd>сolorectal cancer</kwd><kwd>gastric metastasis</kwd><kwd>gastric submucosal formation</kwd><kwd>GIST</kwd><kwd>immunohistochemistry</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">Bray F., Laversanne M., Sung H. et al. Global cancer statistics 2022: GLOBOCAN estimates of incidence and mortality worldwide for 36 cancers in 185 countries. CA Cancer J. 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