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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="en"><front><journal-meta><journal-id journal-id-type="publisher-id">sechenov</journal-id><journal-title-group><journal-title xml:lang="en">Sechenov Medical Journal</journal-title><trans-title-group xml:lang="ru"><trans-title>Сеченовский вестник</trans-title></trans-title-group></journal-title-group><issn pub-type="ppub">2218-7332</issn><issn pub-type="epub">2658-3348</issn><publisher><publisher-name>Сеченовский Университет</publisher-name></publisher></journal-meta><article-meta><article-id pub-id-type="doi">10.47093/2218-7332.2021.12.4.29-38</article-id><article-id custom-type="elpub" pub-id-type="custom">sechenov-414</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="en"><subject>NEUROSURGERY</subject></subj-group><subj-group subj-group-type="section-heading" xml:lang="ru"><subject>НЕЙРОХИРУРГИЯ</subject></subj-group></article-categories><title-group><article-title>Retrospective cohort study of morphological features of recurrent schwannomas and neurofibromas</article-title><trans-title-group xml:lang="ru"><trans-title>Ретроспективное когортное исследование патоморфологических особенностей рецидивных шванном и нейрофибром</trans-title></trans-title-group></title-group><contrib-group><contrib contrib-type="author" corresp="yes"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0002-2801-4485</contrib-id><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Мурзаева</surname><given-names>Д. А.</given-names></name><name name-style="western" xml:lang="en"><surname>Murzaeva</surname><given-names>D. A.</given-names></name></name-alternatives><bio xml:lang="ru"><p> ординатор</p><p>Тел.: +7 (929) 262-30-82</p><p>ул. Льва Толстого, д. 6–8, г. Санкт-Петербург, 197022, Россия </p></bio><bio xml:lang="en"><p> Resident</p><p>Tel.: +7 (929) 262-30-82</p><p>6–8, L’va Tolstogo str., Saint Petersburg, 197022, Russia </p></bio><email xlink:type="simple">dzhamilay22@mail.ru</email><xref ref-type="aff" rid="aff-1"/></contrib><contrib contrib-type="author" corresp="yes"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0001-6206-2133</contrib-id><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Забродская</surname><given-names>Ю. М.</given-names></name><name name-style="western" xml:lang="en"><surname>Zabrodskaya</surname><given-names>Yu. M.</given-names></name></name-alternatives><bio xml:lang="ru"><p> д-р. мед. наук, профессор, руководитель НИЛ патоморфологии нервной системы; старший преподаватель кафедры патологической анатомии </p><p>ул. Маяковского, д. 12, Санкт-Петербург, 191014, Россия</p><p>ул. Академика Лебедева, д. 6, Санкт-Петербург, 194044, Россия</p></bio><bio xml:lang="en"><p> Professor, Dr. of Sci. (Medicine), Head of the Research Laboratory of Pathomorphology of the Nervous System; Senior Lecturer, Department of Pathology</p><p>12, Mayakovskogo str., Saint-Petersburg, 191014, Russia</p><p>6, Academic Lebedev str., Saint-Petersburg, 194044, Russia</p></bio><xref ref-type="aff" rid="aff-2"/></contrib><contrib contrib-type="author" corresp="yes"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0001-8974-1953</contrib-id><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Долгушин</surname><given-names>А. А.</given-names></name><name name-style="western" xml:lang="en"><surname>Dolgushin</surname><given-names>A. A.</given-names></name></name-alternatives><bio xml:lang="ru"><p> аспирант </p><p>ул. Маяковского, д. 12, Санкт-Петербург, 191014, Россия</p></bio><bio xml:lang="en"><p>postgraduate </p><p>12, Mayakovskogo str., Saint-Petersburg, 191014, Russia</p></bio><xref ref-type="aff" rid="aff-3"/></contrib><contrib contrib-type="author" corresp="yes"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0002-0679-197X</contrib-id><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Доброгорская</surname><given-names>Л. Н.</given-names></name><name name-style="western" xml:lang="en"><surname>Dobrogorskaya</surname><given-names>L. N.</given-names></name></name-alternatives><bio xml:lang="ru"><p> лаборант </p><p>ул. Маяковского, д. 12, Санкт-Петербург, 191014, Россия</p></bio><bio xml:lang="en"><p> laboratory assistant</p><p>12, Mayakovskogo str., Saint-Petersburg, 191014, Russia</p></bio><xref ref-type="aff" rid="aff-3"/></contrib><contrib contrib-type="author" corresp="yes"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0001-6597-3733</contrib-id><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Орлов</surname><given-names>А. Ю.</given-names></name><name name-style="western" xml:lang="en"><surname>Orlov</surname><given-names>A. Y.</given-names></name></name-alternatives><bio xml:lang="ru"><p> д-p. мед. наук, врач-нейрохирург </p><p>ул. Маяковского, д. 12, Санкт-Петербург, 191014, Россия</p></bio><bio xml:lang="en"><p>Dr of Sci. (Medicine), neurosurgeon</p><p>12, Mayakovskogo str., Saint-Petersburg, 191014, Russia</p></bio><xref ref-type="aff" rid="aff-3"/></contrib></contrib-group><aff-alternatives id="aff-1"><aff xml:lang="ru"><institution>ФГБОУ ВО «Первый Санкт-Петербургский государственный медицинский университет им. академика И.П. Павлова» Минздрава России</institution><country>Россия</country></aff><aff xml:lang="en"><institution>Pavlov First Saint Petersburg State Medical University</institution><country>Russian Federation</country></aff></aff-alternatives><aff-alternatives id="aff-2"><aff xml:lang="ru"><institution>Российский научно-исследовательский нейрохирургический институт им. проф. А.Л. Поленова – филиал ФГБУ «НМИЦ им. В.А. Алмазова»;&#13;
ФГБВОУ ВО «Военно-медицинская академия им. С.М. Кирова»</institution><country>Россия</country></aff><aff xml:lang="en"><institution>Polenov Neurosurgical Institute, Branch of Almazov National Medical Research Centre;&#13;
Kirov Military Medical Academy</institution><country>Russian Federation</country></aff></aff-alternatives><aff-alternatives id="aff-3"><aff xml:lang="ru"><institution>Российский научно-исследовательский нейрохирургический институт им. проф. А.Л. Поленова – филиал ФГБУ «НМИЦ им. В.А. Алмазова»</institution><country>Россия</country></aff><aff xml:lang="en"><institution>Polenov Neurosurgical Institute, Branch of Almazov National Medical Research Centre</institution><country>Russian Federation</country></aff></aff-alternatives><pub-date pub-type="collection"><year>2021</year></pub-date><pub-date pub-type="epub"><day>29</day><month>11</month><year>2021</year></pub-date><volume>12</volume><issue>4</issue><issue-title>Special Issue "Neurosurgery"</issue-title><fpage>29</fpage><lpage>38</lpage><permissions><copyright-statement>Copyright &amp;#x00A9; Murzaeva D.A., Zabrodskaya Y.M., Dolgushin A.A., Dobrogorskaya L.N., Orlov A.Y., 2021</copyright-statement><copyright-year>2021</copyright-year><copyright-holder xml:lang="ru">Мурзаева Д.А., Забродская Ю.М., Долгушин А.А., Доброгорская Л.Н., Орлов А.Ю.</copyright-holder><copyright-holder xml:lang="en">Murzaeva D.A., Zabrodskaya Y.M., Dolgushin A.A., Dobrogorskaya L.N., Orlov A.Y.</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.sechenovmedj.com/jour/article/view/414">https://www.sechenovmedj.com/jour/article/view/414</self-uri><abstract><p>Recurrences of benign peripheral nerves sheaths tumours (BPNST) after total resection were described in 2.6–11.0% of patients. The significance of the histological features of recurrent BPNST is still insufficiently studied.Aim. To compare the pathomorphological features of recurrent and non-recurrent BPNST (schwannomas and neurofibromas).Materials and methods. A retrospective assessment was made of 101 patients with BPNST with a degree of anaplasia corresponding not more than Grade I. Recurrence of BPNST developed in 13 (12.9%) cases. The study included patients with histological archive: the study group (n = 7) included patients with one or more relapses of BPNST, the control group included patients (n = 5) without relapses after surgery for 5 or more years. The main clinical characteristics were studied and histological examination was performed.Results. There were no differences between the groups in baseline characteristics (the type of tumour (schwannoma, neurofibroma), distribution by sex, age, localization, clinical symptoms). The relapse rate among patients with neurofibromas was 8 in 3 patients vs. 6 in 5 patients with schwannomas. In all cases of recurrent schwannomas and in one of neurofibroma, the histological pattern was predominantly monophasic with rhythmic structures like Verocay bodies with underlined pattern and nuclear hyperchromasia, in contrast to the control group, represented by tumours with a mixed type of structure with uniform alternation of various histological patterns (p &lt; 0,05). Endothelial proliferation and lymphocytic infiltration in the stroma and perivascular area were more common in the relapse group (p &lt; 0.05). Pathomorphological signs of anaplasia: cell-nuclear polymorphism, nuclear hyperchromasia, endothelial proliferation, mitosis, as well as minor signs of anaplasia: solidization, muirization of the fascicular pattern of a tumour and apoptotic bodies were found with the same frequency in both groups. With relapse, the capsule was lost, thinned, intermittent, and sometimes invaded the surrounding tissues.Conclusion. Tumours with the initial signs of anaplasia, such as endothelial proliferation, tendency to hypercellularity, and histological pattern with prominent Verocay bodies dominate among recurrent BPNST.</p></abstract><trans-abstract xml:lang="ru"><p>Рецидивы доброкачественных опухолей оболочек периферических нервов (ООПН) после тотальной резекции описаны у 2,6–11,0% пациентов. Значение гистологических особенностей рецидивирующих ООПН изучено недостаточно.Цель исследования: сравнить патоморфологические особенности рецидивирующих и не рецидивирующих доброкачественных ООПН (шванном и нейрофибром).Материалы и методы. Ретроспективно оценен 101 пациент с доброкачественными ООПН со степенью анаплазии, соответствующей не более Grade I. Рецидив ООПН развился у 13 (12,9%) человек. В исследование включены пациенты, имевшие гистологический архив: в группу исследования (n = 7) вошли пациенты с одним и более рецидивом ООПН, в группу контроля – пациенты (n = 5), не имевшие рецидивов после оперативного вмешательства в течение 5 и более лет. Изучали основные клинические характеристики и проводили гистологическое исследование.Результаты. По исходным характеристикам: тип опухоли (шваннома, нейрофиброма), распределение по полу, возрасту, локализации, клиническим симптомам различий между группами не выявлено. Количество рецидивов среди пациентов с нейрофибромами: 8 у 3 пациентов vs. 6 у 5 пациентов со шванномами. Во всех случаях рецидивных шванном и в одной нейрофиброме гистологический паттерн был преимущественно монофазным с ритмичными структурами по типу телец Верокаи с подчеркнутым рисунком и гиперхроматозом ядер, в отличие от группы контроля, представленной опухолями со смешанным типом строения с равномерным чередованием различных гистологических паттернов (р &lt; 0,05). Пролиферация эндотелия и лимфоцитарная инфильтрация в строме и располагающаяся периваскулярно наблюдались чаще в группе с рецидивами (р &lt; 0,05). Патоморфологические признаки анаплазии: клеточно-ядерный полиморфизм, гиперхромия ядер, пролиферация эндотелия, митозы, а также малые признаки анаплазии: солидизация, муаризация фасцикулярного рисунка опухоли и апоптозные тельца встречались с одинаковой частотой в обеих группах. При рецидивировании наблюдалась потеря капсулы, ее истончение, прерывистость, иногда инвазия в окружающие ткани.Заключение. Среди рецидивирующих доброкачественных ООПН преимущественно встречаются опухоли с начальными признаками анаплазии: пролиферацией эндотелия, тенденцией к гиперцеллюлярности и гистологический паттерн с подчеркнутыми тельцами Верокаи.</p></trans-abstract><kwd-group xml:lang="ru"><kwd>опухоли периферической нервной системы</kwd><kwd>прогностические факторы</kwd><kwd>нейроонкология</kwd><kwd>нейрофиброматоз</kwd><kwd>малые признаки анаплазии</kwd></kwd-group><kwd-group xml:lang="en"><kwd>tumours of the peripheral nervous system</kwd><kwd>prognostic factors</kwd><kwd>neurooncology</kwd><kwd>neurofibromatosis</kwd><kwd>minor signs of anaplasia</kwd></kwd-group><funding-group><funding-statement xml:lang="ru">Исследование было выполнено в рамках государственного задания № 056-00109-21-01(34).</funding-statement><funding-statement xml:lang="en">The study was carried out within the framework of state assignment No. 056-00109-21-01 (34).</funding-statement></funding-group></article-meta></front><back><ref-list><title>References</title><ref id="cit1"><label>1</label><citation-alternatives><mixed-citation xml:lang="ru">Huang M.J., Kano H., Mousavi S.H., et al. 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