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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">Journal of Volgograd State Medical University</journal-id><journal-title-group><journal-title xml:lang="en">Journal of Volgograd State Medical University</journal-title><trans-title-group xml:lang="ru"><trans-title>Вестник Волгоградского государственного медицинского университета</trans-title></trans-title-group></journal-title-group><issn publication-format="print">1994-9480</issn><issn publication-format="electronic">1994-9499</issn><publisher><publisher-name xml:lang="en">Volgograd State Medical University</publisher-name></publisher></journal-meta><article-meta><article-id pub-id-type="publisher-id">263794</article-id><article-id pub-id-type="doi">10.19163/1994-9480-2023-20-2-137-141</article-id><article-categories><subj-group subj-group-type="toc-heading" xml:lang="en"><subject>Original Researches</subject></subj-group><subj-group subj-group-type="toc-heading" xml:lang="ru"><subject>Оригинальные исследования</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">Fibrosis as a key link in the morphogenesis of extragenital endometriosis</article-title><trans-title-group xml:lang="ru"><trans-title>Фиброз как ключевое звено в морфогенезе экстрагенитального эндометриоза</trans-title></trans-title-group></title-group><contrib-group><contrib contrib-type="author"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0001-5322-708X</contrib-id><name-alternatives><name xml:lang="en"><surname>Pechenikova</surname><given-names>Victoria A.</given-names></name><name xml:lang="ru"><surname>Печеникова</surname><given-names>Виктория Анатольевна</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><bio xml:lang="en"><p>Doctor of Medical Sciences, Professor of the Department of Obstetrics and Gynecology</p></bio><bio xml:lang="ru"><p>доктор медицинских наук, профессор кафедры акушерства и гинекологии</p></bio><email>p-vikka@mail.ru</email><xref ref-type="aff" rid="aff1"/></contrib><contrib contrib-type="author"><name-alternatives><name xml:lang="en"><surname>Korchinskaya</surname><given-names>Anastasia D.</given-names></name><name xml:lang="ru"><surname>Корчинская</surname><given-names>Анастасия Денисовна</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><bio xml:lang="en"><p>student of the Faculty of Medicine</p></bio><bio xml:lang="ru"><p>студентка лечебного факультета</p></bio><email>dr.ramzaeva@mail.ru</email><xref ref-type="aff" rid="aff2"/></contrib><contrib contrib-type="author"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0001-6849-5335</contrib-id><name-alternatives><name xml:lang="en"><surname>Petrovskaya</surname><given-names>Nicole N.</given-names></name><name xml:lang="ru"><surname>Петровская</surname><given-names>Николь Николаевна</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><bio xml:lang="en"><p>Obstetrician-gynecologist of the Department of Gynecology</p></bio><bio xml:lang="ru"><p>врач – акушер-гинеколог отделения гинекологии</p></bio><email>dr.ramzaeva@mail.ru</email><xref ref-type="aff" rid="aff2"/></contrib></contrib-group><aff-alternatives id="aff1"><aff><institution xml:lang="en">I.I. Mechnikov Northwestern State Medical University</institution></aff><aff><institution xml:lang="ru">Северо-Западный государственный медицинский университет имени И.И. Мечникова</institution></aff><aff><institution xml:lang="zh"></institution></aff></aff-alternatives><aff-alternatives id="aff2"><aff><institution xml:lang="en">I.I. Mechnikov Northwestern State Medical University</institution></aff><aff><institution xml:lang="ru">Северо-Западный государственный медицинский университет имени И.И. Мечникова</institution></aff></aff-alternatives><pub-date date-type="pub" iso-8601-date="2023-07-30" publication-format="electronic"><day>30</day><month>07</month><year>2023</year></pub-date><volume>20</volume><issue>2</issue><issue-title xml:lang="en"/><issue-title xml:lang="ru"/><fpage>137</fpage><lpage>141</lpage><history><date date-type="received" iso-8601-date="2023-02-21"><day>21</day><month>02</month><year>2023</year></date></history><permissions><copyright-statement xml:lang="en">Copyright ©; 2023, Pechenikova V.A., Korchinskaya A.D., Petrovskaya N.N.</copyright-statement><copyright-statement xml:lang="ru">Copyright ©; 2023, Печеникова В.А., Корчинская А.Д., Петровская Н.Н.</copyright-statement><copyright-year>2023</copyright-year><copyright-holder xml:lang="en">Pechenikova V.A., Korchinskaya A.D., Petrovskaya N.N.</copyright-holder><copyright-holder xml:lang="ru">Печеникова В.А., Корчинская А.Д., Петровская Н.Н.</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://journals.eco-vector.com/1994-9480/article/view/263794">https://journals.eco-vector.com/1994-9480/article/view/263794</self-uri><abstract xml:lang="en"><p>The clinical of extragenital endometriosis is variable and depends on the localization, while the leading manifestation is a pronounced pain syndrome, which in some cases can simulate various surgical pathologies. <bold>Materials and methods:</bold> A morphological and IHC study was performed in 82 cases of extragenital endometriosis of various localization. <bold>Research results</bold>: An IHC study showed positive expression of α-SMA in fibrosis foci around and between endometriosis foci. The expression area of TGF-β1 was different for the cytogenic stroma and the perifocally located connective tissue. <bold>Conclusions:</bold> Fibrosis is an integral component of the morphogenesis of endometrioid heterotopias, while the degree of its severity depends on the duration of the existence of endometriosis foci. Severe pain syndrome is probably associated with deformation of organs and tissues, compression of nerve endings due to fibrosis processes.</p></abstract><trans-abstract xml:lang="ru"><p>Клиническая картина экстрагенитального эндометриоза вариабельна и зависит от локализации, при этом ведущим проявлением является выраженный болевой синдром, что в ряде случаев может имитировать различную хирургическую патологию. <bold>Материалы и методы</bold>: Выполнено морфологическое и ИГХ-исследование 82 случаев экстрагенитального эндометриоза различной локализации. <bold>Результаты исследования:</bold> При ИГХ-исследовании наблюдалась положительная экспрессия α-гладкомышечного актина в фокусах фиброза вокруг и между очагами эндометриоза. Площадь экспрессии трансформирующего фактора роста β-1 была различной для цитогенной стромы и перифокально расположенной соединительной ткани. <bold>Выводы:</bold> Фиброз является неотъемлемым компонентом морфогенеза эндометриоидных гетеротопий, при этом степень его выраженности зависит от длительности существования очагов эндометриоза. Выраженный болевой синдром, вероятно, связан с деформацией органов и тканей, сдавлением нервных окончаний вследствие процессов фиброзирования.</p></trans-abstract><kwd-group xml:lang="en"><kwd>extragenital endometriosis</kwd><kwd>transforming growth factor β-1</kwd><kwd>fibrosis</kwd><kwd>α-smooth muscle actin</kwd></kwd-group><kwd-group xml:lang="ru"><kwd>экстрагенитальный эндометриоз</kwd><kwd>трансформирующий фактор роста β-1</kwd><kwd>фиброз</kwd><kwd>α-гладкомышечный актин</kwd></kwd-group><funding-group/></article-meta></front><body></body><back><ref-list><ref id="B1"><label>1.</label><mixed-citation>Печеникова В.А., Данилова А.С., Кварку В.Е., Рамзаева Н.Н. Эндометриоз кишечника: особенности клинической и морфологической диагностики. Вестник Российской Военно-медицинской академии. 2021;1(23):41–50. doi: 10.17816/brmma63572.</mixed-citation></ref><ref id="B2"><label>2.</label><mixed-citation>Bruner-Tran K.L., Herington J.L., Duleba A.J. et al. 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