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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="other" dtd-version="1.2" xml:lang="en"><front><journal-meta><journal-id journal-id-type="publisher-id">Surgery and Oncology</journal-id><journal-title-group><journal-title xml:lang="en">Surgery and Oncology</journal-title><trans-title-group xml:lang="ru"><trans-title>Хирургия и онкология</trans-title></trans-title-group></journal-title-group><issn publication-format="electronic">2949-5857</issn><publisher><publisher-name xml:lang="en">Publishing House ABV Press</publisher-name></publisher></journal-meta><article-meta><article-id pub-id-type="publisher-id">645</article-id><article-id pub-id-type="doi">10.17650/2949-5857-2023-13-3-44-48</article-id><article-categories><subj-group subj-group-type="toc-heading" xml:lang="en"><subject>CASE REPORT</subject></subj-group><subj-group subj-group-type="toc-heading" xml:lang="ru"><subject>КЛИНИЧЕСКОЕ НАБЛЮДЕНИЕ</subject></subj-group><subj-group subj-group-type="article-type"><subject></subject></subj-group></article-categories><title-group><article-title xml:lang="en">Non-organ mesothelial cyst of the abdominal cavity. Clinical observation</article-title><trans-title-group xml:lang="ru"><trans-title>Неорганная мезотелиальная киста брюшной полости. Клиническое наблюдение</trans-title></trans-title-group></title-group><contrib-group><contrib contrib-type="author"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0003-0489-9538</contrib-id><name-alternatives><name xml:lang="en"><surname>Matveev</surname><given-names>I. V.</given-names></name><name xml:lang="ru"><surname>Матвеев</surname><given-names>И. В.</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><bio xml:lang="en"><p>Igor Vladimirovich Matveev</p><p>Build. 6, 86 Entuziastov highway, Moscow 11112</p></bio><bio xml:lang="ru"><p>Игорь Владимирович Матвеев</p><p>111123 Москва, шоссе Энтузиастов, 86, стр. 6</p></bio><email>i.matveev@mknc.ru</email><xref ref-type="aff" rid="aff1"/></contrib><contrib contrib-type="author"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0001-9439-9873</contrib-id><name-alternatives><name xml:lang="en"><surname>Danilov</surname><given-names>M. A.</given-names></name><name xml:lang="ru"><surname>Данилов</surname><given-names>М. А.</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><bio xml:lang="en"><p>Build. 6, 86 Entuziastov highway, Moscow 11112</p></bio><bio xml:lang="ru"><p>111123 Москва, шоссе Энтузиастов, 86, стр. 6</p></bio><xref ref-type="aff" rid="aff1"/></contrib><contrib contrib-type="author"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0003-0889-2720</contrib-id><name-alternatives><name xml:lang="en"><surname>Karnaukhov</surname><given-names>N. S.</given-names></name><name xml:lang="ru"><surname>Карнаухов</surname><given-names>Н. С.</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><bio xml:lang="en"><p>Build. 6, 86 Entuziastov highway, Moscow 11112</p></bio><bio xml:lang="ru"><p>111123 Москва, шоссе Энтузиастов, 86, стр. 6</p></bio><xref ref-type="aff" rid="aff1"/></contrib><contrib contrib-type="author"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0003-0140-9759</contrib-id><name-alternatives><name xml:lang="en"><surname>Maksimenko</surname><given-names>A. V.</given-names></name><name xml:lang="ru"><surname>Максименко</surname><given-names>А. В.</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><bio xml:lang="en"><p>Build. 6, 86 Entuziastov highway, Moscow 11112</p></bio><bio xml:lang="ru"><p>111123 Москва, шоссе Энтузиастов, 86, стр. 6</p></bio><xref ref-type="aff" rid="aff1"/></contrib><contrib contrib-type="author"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0003-3363-6841</contrib-id><name-alternatives><name xml:lang="en"><surname>Leontiev</surname><given-names>A. V.</given-names></name><name xml:lang="ru"><surname>Леонтьев</surname><given-names>А. В.</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><bio xml:lang="en"><p>Build. 6, 86 Entuziastov highway, Moscow 11112</p></bio><bio xml:lang="ru"><p>111123 Москва, шоссе Энтузиастов, 86, стр. 6</p></bio><xref ref-type="aff" rid="aff1"/></contrib><contrib contrib-type="author"><contrib-id contrib-id-type="orcid">https://orcid.org/0009-0001-9293-629X</contrib-id><name-alternatives><name xml:lang="en"><surname>Valieva</surname><given-names>A. M.</given-names></name><name xml:lang="ru"><surname>Валиева</surname><given-names>А. М.</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><bio xml:lang="en"><p>Build. 6, 86 Entuziastov highway, Moscow 11112</p></bio><bio xml:lang="ru"><p>111123 Москва, шоссе Энтузиастов, 86, стр. 6</p></bio><xref ref-type="aff" rid="aff1"/></contrib><contrib contrib-type="author"><name-alternatives><name xml:lang="en"><surname>Tsvirkun</surname><given-names>V. V.</given-names></name><name xml:lang="ru"><surname>Цвиркун</surname><given-names>В. В.</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><bio xml:lang="en"><p>Build. 6, 86 Entuziastov highway, Moscow 11112</p></bio><bio xml:lang="ru"><p>111123 Москва, шоссе Энтузиастов, 86, стр. 6</p></bio><xref ref-type="aff" rid="aff1"/></contrib></contrib-group><aff-alternatives id="aff1"><aff><institution xml:lang="en">A. S. Loginov Moscow Clinical Research and Practice Center of the Moscow City Health Department</institution></aff><aff><institution xml:lang="ru">БУЗ «Московский клинический научно-практический центр им. А. С. Логинова Департамента здравоохранения города Москвы»</institution></aff></aff-alternatives><pub-date date-type="pub" iso-8601-date="2023-12-21" publication-format="electronic"><day>21</day><month>12</month><year>2023</year></pub-date><volume>13</volume><issue>3</issue><issue-title xml:lang="en"/><issue-title xml:lang="ru"/><fpage>44</fpage><lpage>48</lpage><history><date date-type="received" iso-8601-date="2023-12-21"><day>21</day><month>12</month><year>2023</year></date><date date-type="accepted" iso-8601-date="2023-12-21"><day>21</day><month>12</month><year>2023</year></date></history><permissions><copyright-statement xml:lang="en">Copyright ©; 2023, Matveev I.V., Danilov M.A., Karnaukhov N.S., Maksimenko A.V., Leontiev A.V., Valieva A.M., Tsvirkun V.V.</copyright-statement><copyright-statement xml:lang="ru">Copyright ©; 2023, Матвеев И.В., Данилов М.А., Карнаухов Н.С., Максименко А.В., Леонтьев А.В., Валиева А.М., Цвиркун В.В.</copyright-statement><copyright-year>2023</copyright-year><copyright-holder xml:lang="en">Matveev I.V., Danilov M.A., Karnaukhov N.S., Maksimenko A.V., Leontiev A.V., Valieva A.M., Tsvirkun V.V.</copyright-holder><copyright-holder xml:lang="ru">Матвеев И.В., Данилов М.А., Карнаухов Н.С., Максименко А.В., Леонтьев А.В., Валиева А.М., Цвиркун В.В.</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://onco-surgery.info/jour/article/view/645">https://onco-surgery.info/jour/article/view/645</self-uri><abstract xml:lang="en"><p>Non-organ cysts of mesothelial origin are one of the groups of cystic neoplasms with rare and difficult-to-diagnose pathology of the abdominal cavity and retroperitoneal space. Today, the etiological factors remain the subject of interdisciplinary discussions, their clinical manifestations are non-specific, and their differential diagnosis is diverse. Often, these neoplasms become accidentally detected during surgical interventions or during routine diagnostic examinations. Currently, there are no uniform standards or recommendations to treat such diseases, however, according to literature sources, there is a consensus that mesothelial cysts of the retroperitoneal space and abdominal cavity should be completely removed within healthy tissues. Today, modern medical achievements and accumulated long-term experience allow us to successfully diagnose and perform radical treatment for any localization of such neoplasms. We present our own experience from the clinical practice of successful surgical treatment of non-organ cysts of mesothelial origin.</p></abstract><trans-abstract xml:lang="ru"><p>Неорганные кисты мезотелиального происхождения представляют собой одну из групп кистозных новообразований с редкой и труднодиагностируемой патологией брюшной полости и забрюшинного пространства. Этиологические факторы остаются на сегодняшний день предметом междисциплинарных дискуссий, их клинические проявления неспецифичны, а дифференциальная диагностика – многообразна. Нередко данные новообразования становятся случайно обнаруженными во время хирургических вмешательств или при плановых диагностических осмотрах. В настоящее время не существует единых стандартов или рекомендаций по лечению таких заболеваний, однако согласно источникам литературы сформировано единое мнение: мезотелиальные кисты забрюшинного пространства и брюшной полости подлежат полному удалению в пределах здоровых тканей. На сегодняшний день современные достижения медицины и накопленный многолетний опыт позволяют успешно диагностировать и выполнять радикальное лечение при любой локализации подобных новообразований. Нами представлен собственный опыт из клинической практики успешного хирургического лечения неорганной кисты мезотелиального происхождения.</p></trans-abstract><kwd-group xml:lang="en"><kwd>mesothelial cyst</kwd><kwd>abdominal cyst</kwd><kwd>retroperitoneal cyst</kwd><kwd>extraorgan tumor</kwd><kwd>mesothelial lining</kwd></kwd-group><kwd-group xml:lang="ru"><kwd>мезотелиальная киста</kwd><kwd>киста брюшной полости</kwd><kwd>киста забрюшинного пространства</kwd><kwd>неорганная опухоль</kwd><kwd>мезотелиальная выстилка</kwd></kwd-group><funding-group/></article-meta></front><body></body><back><ref-list><ref id="B1"><label>1.</label><mixed-citation>Osman S., Lehnert B.E., Elojeimy S. et al. A comprehensive review of the retroperitoneal anatomy, neoplasms and pattern of disease spread. 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