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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">Russian Journal of Pediatric Surgery</journal-id><journal-title-group><journal-title xml:lang="en">Russian Journal of Pediatric Surgery</journal-title><trans-title-group xml:lang="ru"><trans-title>Детская хирургия</trans-title></trans-title-group></journal-title-group><issn publication-format="print">1560-9510</issn><issn publication-format="electronic">2412-0677</issn><publisher><publisher-name xml:lang="en">Eco-Vector</publisher-name></publisher></journal-meta><article-meta><article-id pub-id-type="publisher-id">870</article-id><article-id pub-id-type="doi">10.17816/ps870</article-id><article-id pub-id-type="edn">ODSWGI</article-id><article-categories><subj-group subj-group-type="toc-heading" xml:lang="en"><subject>Case reports</subject></subj-group><subj-group subj-group-type="toc-heading" xml:lang="ru"><subject>Клинические случаи</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">Appendix carcinoid under the mask of acute appendicitis in children</article-title><trans-title-group xml:lang="ru"><trans-title>Карциноид аппендикса под маской острого аппендицита у детей</trans-title></trans-title-group></title-group><contrib-group><contrib contrib-type="author"><contrib-id contrib-id-type="orcid">https://orcid.org/0009-0007-8895-8094</contrib-id><contrib-id contrib-id-type="spin">2917-9451</contrib-id><name-alternatives><name xml:lang="en"><surname>Pleshkov</surname><given-names>Stanislav A.</given-names></name><name xml:lang="ru"><surname>Плешков</surname><given-names>Станислав Александрович</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><email>stanislavpleshkov@yandex.ru</email><xref ref-type="aff" rid="aff1"/><xref ref-type="aff" rid="aff2"/></contrib><contrib contrib-type="author"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0003-4731-2952</contrib-id><contrib-id contrib-id-type="spin">7405-5077</contrib-id><name-alternatives><name xml:lang="en"><surname>Vlasov</surname><given-names>Alexey P.</given-names></name><name xml:lang="ru"><surname>Власов</surname><given-names>Алексей Петрович</given-names></name></name-alternatives><bio xml:lang="en"><p>MD, Dr. Sci. (Medicine), Professor</p></bio><bio xml:lang="ru"><p>д-р мед. наук, профессор</p></bio><email>vap.61@yandex.ru</email><xref ref-type="aff" rid="aff1"/></contrib><contrib contrib-type="author"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0002-7182-2197</contrib-id><contrib-id contrib-id-type="spin">9726-0748</contrib-id><name-alternatives><name xml:lang="en"><surname>Okuneva</surname><given-names>Alexandra I.</given-names></name><name xml:lang="ru"><surname>Окунева</surname><given-names>Александра Ивановна</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><bio xml:lang="en"><p>MD, Cand. Sci. (Medicine)</p></bio><bio xml:lang="ru"><p>канд. мед. наук</p></bio><email>toropkinaokuneva@yandex.ru</email><xref ref-type="aff" rid="aff1"/></contrib><contrib contrib-type="author"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0003-4944-369X</contrib-id><contrib-id contrib-id-type="spin">9865-7253</contrib-id><name-alternatives><name xml:lang="en"><surname>Pleshkova</surname><given-names>Raisa A.</given-names></name><name xml:lang="ru"><surname>Плешкова</surname><given-names>Раиса Андреевна</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><email>raisa.a.chernyshova@mail.ru</email><xref ref-type="aff" rid="aff1"/></contrib><contrib contrib-type="author"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0001-5902-0370</contrib-id><contrib-id contrib-id-type="spin">7053-6376</contrib-id><name-alternatives><name xml:lang="en"><surname>Lukyanova</surname><given-names>Ksenia K.</given-names></name><name xml:lang="ru"><surname>Лукьянова</surname><given-names>Ксения Константиновна</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><email>ksusha22_07_99@icloud.com</email><xref ref-type="aff" rid="aff1"/><xref ref-type="aff" rid="aff2"/></contrib><contrib contrib-type="author"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0001-8786-6998</contrib-id><contrib-id contrib-id-type="spin">9705-0818</contrib-id><name-alternatives><name xml:lang="en"><surname>Okunev</surname><given-names>Nicolai A.</given-names></name><name xml:lang="ru"><surname>Окунев</surname><given-names>Николай Александрович</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><bio xml:lang="en"><p>MD, Dr. Sci. (Medicine)</p></bio><bio xml:lang="ru"><p>д-р мед. наук</p></bio><email>nicolai.okunev@yandex.ru</email><xref ref-type="aff" rid="aff1"/></contrib></contrib-group><aff-alternatives id="aff1"><aff><institution xml:lang="en">National Research Mordovian State University named after N.P. Ogarev</institution></aff><aff><institution xml:lang="ru">Национальный исследовательский Мордовский государственный университет имени Н.П. Огарева</institution></aff></aff-alternatives><aff-alternatives id="aff2"><aff><institution xml:lang="en">Children's Republican Clinical Hospital</institution></aff><aff><institution xml:lang="ru">Детская республиканская клиническая больница</institution></aff></aff-alternatives><pub-date date-type="preprint" iso-8601-date="2025-08-09" publication-format="electronic"><day>09</day><month>08</month><year>2025</year></pub-date><pub-date date-type="pub" iso-8601-date="2025-08-26" publication-format="electronic"><day>26</day><month>08</month><year>2025</year></pub-date><volume>29</volume><issue>4</issue><issue-title xml:lang="en"/><issue-title xml:lang="ru"/><fpage>279</fpage><lpage>284</lpage><history><date date-type="received" iso-8601-date="2025-05-14"><day>14</day><month>05</month><year>2025</year></date><date date-type="accepted" iso-8601-date="2025-08-03"><day>03</day><month>08</month><year>2025</year></date></history><permissions><copyright-statement xml:lang="en">Copyright ©; 2025, Eco-Vector</copyright-statement><copyright-statement xml:lang="ru">Copyright ©; 2025, Эко-Вектор</copyright-statement><copyright-year>2025</copyright-year><copyright-holder xml:lang="en">Eco-Vector</copyright-holder><copyright-holder xml:lang="ru">Эко-Вектор</copyright-holder><ali:free_to_read xmlns:ali="http://www.niso.org/schemas/ali/1.0/" start_date="2026-08-26"/><license><ali:license_ref xmlns:ali="http://www.niso.org/schemas/ali/1.0/">https://creativecommons.org/licenses/by-nc-nd/4.0/</ali:license_ref></license></permissions><self-uri xlink:href="https://jps-nmp.ru/jour/article/view/870">https://jps-nmp.ru/jour/article/view/870</self-uri><abstract xml:lang="en"><p>Recently, there has been an increase in the number of neuroendocrine tumors in children. As a rule, such tumors are asymptomatic, thus leading to the spread of atypical foci. Carcinoid neuroendocrine tumors of the gastrointestinal tract can be localized in any part, but the most common location is appendix. Neuroendocrine tumors of the appendix in children are often manifested with the clinical picture of acute appendicitis, which necessitates a special oncological vigilance in relation to malignant processes of the altered appendix.</p> <p>The article describes three clinical cases of diagnosis, treatment, and catamnesis of appendix carcinoids identified during laparoscopic appendectomy and histological examination. All patients were urgently admitted for inpatient treatment at the Children's Republican Clinical Hospital of Saransk in 2021–2024 with clinical symptoms of acute abdominal pain. Due to timely diagnostics and treatment, laparoscopic appendectomy was a proper and sufficient approach in all cases for adequate recovery.</p> <p>Thus, histological examination of an altered appendix is an extremely important diagnostic tool not only for the final verification of the diagnosis, but also for the exclusion of atypical changes. If there the morphological picture of carcinoid, additional diagnostic steps are needed to provide early diagnosis and timely treatment of metastatic areas.</p></abstract><trans-abstract xml:lang="ru"><p>В последнее время наблюдается увеличение количества нейроэндокринных опухолей у детей. Как правило, такие опухоли протекают бессимптомно, вследствие чего отмечается рост и распространение атипичных очагов. Карциноидные нейроэндокринные опухоли желудочно-кишечного тракта могут локализоваться в любом отделе, но самое частое их местоположение ― червеобразный отросток. Нейроэндокринные опухоли червеобразного отростка у детей зачастую имеют клиническую картину острого аппендицита, в связи с чем возникает необходимость в особой онконастороженности в отношении злокачественных процессов изменённого аппендикса.</p> <p>В статье приводится описание трёх клинических случаев диагностики, лечения и данных катамнеза карциноидов аппендикса, выявленных при лапароскопической аппендэктомии с использованием гистологического исследования. Все пациенты поступили в экстренном порядке на стационарное лечение в Детскую республиканскую клиническую больницу города Саранска в период 2021–2024 годов с клиническими симптомами острого живота. Благодаря своевременной диагностике и лечению во всех случаях лапароскопическая аппендэктомия являлась достаточным объёмом для выздоровления пациентов.</p> <p>Таким образом, гистологическая верификация при изменённом аппендиксе является крайне важным методом диагностики не только для окончательной верификации диагноза, но и для исключения атипичных изменений. При морфологической картине карциноида необходима дополнительная диагностика, что позволяет провести раннюю диагностику и своевременное лечение метастазированных участков.</p></trans-abstract><kwd-group xml:lang="en"><kwd>acute phlegmonous appendicitis</kwd><kwd>neuroendocrine tumor</kwd><kwd>appendix</kwd><kwd>laparoscopic appendectomy</kwd></kwd-group><kwd-group xml:lang="ru"><kwd>острый флегмонозный аппендицит</kwd><kwd>нейроэндокринная опухоль</kwd><kwd>червеобразный отросток</kwd><kwd>лапароскопическая аппендэктомия</kwd></kwd-group><funding-group/></article-meta></front><body></body><back><ref-list><ref id="B1"><label>1.</label><mixed-citation>Menshikov KV, Sultanbaev AV, Musin ShI, et al. Neuroendocrine tumours: a literature review. Creative surgery and oncology. 2021;11(2):174–182. doi: 10.24060/2076-3093-2021-11-2-174-182 EDN: RTJQRK</mixed-citation></ref><ref id="B2"><label>2.</label><mixed-citation>Grinevich VE, Morozova OS. Neuroendocrine tumors of the GIT. 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