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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">Obstetrics and Gynecology</journal-id><journal-title-group><journal-title xml:lang="en">Obstetrics and Gynecology</journal-title><trans-title-group xml:lang="ru"><trans-title>Акушерство и гинекология</trans-title></trans-title-group></journal-title-group><issn publication-format="print">0300-9092</issn><issn publication-format="electronic">2412-5679</issn><publisher><publisher-name xml:lang="en">Bionika Media</publisher-name></publisher></journal-meta><article-meta><article-id pub-id-type="publisher-id">716480</article-id><article-id pub-id-type="doi">10.18565/aig.2026.30</article-id><article-categories><subj-group subj-group-type="toc-heading" xml:lang="en"><subject>Original Articles</subject></subj-group><subj-group subj-group-type="toc-heading" xml:lang="ru"><subject>Оригинальные статьи</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">Unexplained antenatal fetal death in full-term pregnancy</article-title><trans-title-group xml:lang="ru"><trans-title>Антенатальная гибель плода неуточненная при доношенной беременности</trans-title></trans-title-group></title-group><contrib-group><contrib contrib-type="author"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0003-0175-1968</contrib-id><name-alternatives><name xml:lang="en"><surname>Kurtser</surname><given-names>Mark A.</given-names></name><name xml:lang="ru"><surname>Курцер</surname><given-names>Марк Аркадьевич</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><bio xml:lang="en"><p>Academician of the RAS, Dr. Med. Sci., Professor, Head of the Academician G.M. Savelyeva Department of Obstetrics and Gynecology, Institute of Motherhood and Childhood</p></bio><bio xml:lang="ru"><p>академик РАН, д.м.н., профессор, заведующий кафедрой акушерства и гинекологии им. акад. Г.М. Савельевой Института материнства и детства</p></bio><email>kurtser_ma@rsmu.ru</email><xref ref-type="aff" rid="aff1"/></contrib><contrib contrib-type="author"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0003-2658-5417</contrib-id><name-alternatives><name xml:lang="en"><surname>Kalashnikov</surname><given-names>Sergey A.</given-names></name><name xml:lang="ru"><surname>Калашников</surname><given-names>Сергей Аркадьевич</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><bio xml:lang="en"><p>Dr. Med. Sci., Professor, Academician G.M. Savelyeva Department of Obstetrics and Gynecology, Institute of Motherhood and Childhood</p></bio><bio xml:lang="ru"><p>д.м.н., профессор кафедры акушерства и гинекологии им. акад. Г.М. Савельевой Института материнства и детства</p></bio><email>kalashnikov_sa@rsmu.ru</email><xref ref-type="aff" rid="aff1"/></contrib><contrib contrib-type="author"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0003-4484-2229</contrib-id><name-alternatives><name xml:lang="en"><surname>Voskoboeva</surname><given-names>Ksenia Y.</given-names></name><name xml:lang="ru"><surname>Воскобоева</surname><given-names>Ксения Юрьевна</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><bio xml:lang="en"><p>PhD student, Academician G.M. Savelyeva Department of Obstetrics and Gynecology, Institute of Motherhood and Childhood</p></bio><bio xml:lang="ru"><p>аспирант кафедры акушерства и гинекологии им. акад. Г.М. Савельевой Института материнства и детства</p></bio><email>voskoboeva96@bk.ru</email><xref ref-type="aff" rid="aff1"/></contrib></contrib-group><aff-alternatives id="aff1"><aff><institution xml:lang="en">Pirogov Russian National Research Medical University, Ministry of Health of Russia (Pirogov University)</institution></aff><aff><institution xml:lang="ru">ФГАОУ ВО «Российский национальный исследовательский медицинский университет имени Н.И. Пирогова» Минздрава России (Пироговский Университет)</institution></aff></aff-alternatives><pub-date date-type="pub" iso-8601-date="2026-07-17" publication-format="electronic"><day>17</day><month>07</month><year>2026</year></pub-date><issue>6</issue><issue-title xml:lang="en"/><issue-title xml:lang="ru"/><fpage>101</fpage><lpage>108</lpage><history><date date-type="received" iso-8601-date="2026-07-16"><day>16</day><month>07</month><year>2026</year></date><date date-type="accepted" iso-8601-date="2026-07-16"><day>16</day><month>07</month><year>2026</year></date></history><permissions><copyright-statement xml:lang="en">Copyright ©; 2026, Bionika Media</copyright-statement><copyright-statement xml:lang="ru">Copyright ©; 2026, ООО «Бионика Медиа»</copyright-statement><copyright-year>2026</copyright-year><copyright-holder xml:lang="en">Bionika Media</copyright-holder><copyright-holder xml:lang="ru">ООО «Бионика Медиа»</copyright-holder></permissions><self-uri xlink:href="https://journals.eco-vector.com/0300-9092/article/view/716480">https://journals.eco-vector.com/0300-9092/article/view/716480</self-uri><abstract xml:lang="en"><p><bold>Objective.</bold> To identify the features of anamnestic data, the course of pregnancy and the results of pathological examination in patients with antenatal death of full-term fetuses depending on the presence of meconium in the amniotic fluid.</p> <p><bold>Materials and methods.</bold> A retrospective analysis of individual pregnancy records, birth histories, and autopsy reports for 83 cases of stillbirth from 2021 to 2023 was conducted. The patients were divided into 2 groups: Group I included the patients with meconium-stained amniotic fluid (MSAF) (n=55); Group II included the patients with clear amniotic fluid (n=28).</p> <p><bold>Results.</bold> The patients in Group I most often had a history of induced abortion (p=0,048), abnormal placental attachment, and oligohydramnios, that can be a marker of MSAF (p=0,041). At the time of fetal death, the length of pregnancy in Group I was longer than in Group II (p=0,003). The frequency of fatty involution of thymus was comparable in stillbirths in both groups. The signs of chronic placental insufficiency and inflammatory-immune disorders were observed in most placental samples collected from both groups.</p> <p><bold>Conclusion.</bold> No direct association was found between fetal distress that led to antenatal death and MSAF. The probability of MSAF increases with increasing gestational age and oligohydramnios. More intensive fetal monitoring is essential in the second half of the third trimester of pregnancy in high-risk patients.</p></abstract><trans-abstract xml:lang="ru"><p><bold>Цель.</bold> Выявить особенности анамнестических данных, течения беременности и результатов патологоанатомического исследования у пациенток с антенатально погибшими доношенными плодами в зависимости от наличия мекония в амниотической жидкости.</p> <p><bold>Материалы и методы.</bold> Проведен ретроспективный анализ индивидуальных карт беременных, историй родов и протоколов патологоанатомического вскрытия 83 мертворожденных за 2021–2023 гг. Пациентки были разделены на 2 группы: I группа – пациентки с мекониальным окрашиванием амниотической жидкости (МОАЖ) (n=55), II группа – пациентки со светлой амниотической жидкостью (n=28).</p> <p><bold>Результаты.</bold> У пациенток I группы в анамнезе чаще отмечались искусственное прерывание беременности (р=0,048), патология прикрепления плаценты, маловодие, которое может являться маркером МОАЖ (р=0,041). На момент гибели плода срок гестации в I группе был больше, чем во II группе (р=0,003). Преждевременная жировая трансформация вилочковой железы с сопоставимой частотой отмечалась у мертворожденных обеих групп. В большинстве образцов плацент обеих групп отмечались признаки хронической плацентарной недостаточности и воспалительно-иммунных нарушений.</p> <p><bold>Заключение.</bold> Не выявлено прямой связи между дистрессом плода, приведшем к антенатальной гибели и МОАЖ. Вероятность МОАЖ возрастает с увеличением гестационного возраста плода и маловодия. Необходимо более интенсивное наблюдение за функциональным состоянием плода во второй половине III триместра беременности у пациенток группы высокого риска.</p></trans-abstract><kwd-group xml:lang="en"><kwd>antenatal fetal death</kwd><kwd>antenatal care</kwd><kwd>autopsy</kwd><kwd>meconium-stained amniotic fluid</kwd><kwd>stillbirth</kwd><kwd>placental morphology</kwd><kwd>sudden fetal death syndrome</kwd></kwd-group><kwd-group xml:lang="ru"><kwd>антенатальная гибель плода</kwd><kwd>антенатальное наблюдение</kwd><kwd>аутопсия</kwd><kwd>мекониальное окрашивание амниотической жидкости</kwd><kwd>мертворождаемость</kwd><kwd>морфология плаценты</kwd><kwd>синдром внезапной смерти плода</kwd></kwd-group><funding-group/></article-meta></front><body></body><back><ref-list><ref id="B1"><label>1.</label><mixed-citation>Thornton H.V., Cornish R.P., Lawlor D.A. 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