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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 Oncology</journal-id><journal-title-group><journal-title xml:lang="en">Russian Journal of Oncology</journal-title><trans-title-group xml:lang="ru"><trans-title>Российский онкологический журнал</trans-title></trans-title-group></journal-title-group><issn publication-format="print">1028-9984</issn><issn publication-format="electronic">2412-9119</issn><publisher><publisher-name xml:lang="en">Eco-Vector</publisher-name></publisher></journal-meta><article-meta><article-id pub-id-type="publisher-id">635447</article-id><article-id pub-id-type="doi">10.17816/onco635447</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">Stereotactic Radiotherapy for Residual Tumor after Chondrosarcoma Surgery: Clinical Case</article-title><trans-title-group xml:lang="ru"><trans-title>Стереотаксическая лучевая терапия остаточной опухоли после хирургического удаления хондросаркомы: клинический случай</trans-title></trans-title-group></title-group><contrib-group><contrib contrib-type="author"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0002-4625-9531</contrib-id><contrib-id contrib-id-type="spin">5046-3349</contrib-id><name-alternatives><name xml:lang="en"><surname>Chernyaev</surname><given-names>Denis V.</given-names></name><name xml:lang="ru"><surname>Черняев</surname><given-names>Денис Владимирович</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><email>denisonco@mail.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/0009-0001-5230-1791</contrib-id><contrib-id contrib-id-type="spin">6728-8988</contrib-id><name-alternatives><name xml:lang="en"><surname>Kozin</surname><given-names>Valery A.</given-names></name><name xml:lang="ru"><surname>Козин</surname><given-names>Валерий Александрович</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><email>val.kozin@mail.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/0000-0002-7210-3020</contrib-id><contrib-id contrib-id-type="spin">3632-8415</contrib-id><name-alternatives><name xml:lang="en"><surname>Zukov</surname><given-names>Ruslan A.</given-names></name><name xml:lang="ru"><surname>Зуков</surname><given-names>Руслан Александрович</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><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>zukov_rus@mail.ru</email><xref ref-type="aff" rid="aff1"/><xref ref-type="aff" rid="aff2"/></contrib></contrib-group><aff-alternatives id="aff1"><aff><institution xml:lang="en">Professor V.F. Voino-Yasenetsky Krasnoyarsk State Medical University</institution></aff><aff><institution xml:lang="ru">Красноярский государственный медицинский университет им. проф. В.Ф. Войно-Ясенецкого</institution></aff></aff-alternatives><aff-alternatives id="aff2"><aff><institution xml:lang="en">Krasnoyarsk Regional Clinical Oncology Dispensary named after A.I. Kryzhanovsky</institution></aff><aff><institution xml:lang="ru">Красноярский краевой клинический онкологический диспансер им. А.И. Крыжановского</institution></aff></aff-alternatives><pub-date date-type="preprint" iso-8601-date="2025-03-01" publication-format="electronic"><day>01</day><month>03</month><year>2025</year></pub-date><pub-date date-type="pub" iso-8601-date="2024-12-25" publication-format="electronic"><day>25</day><month>12</month><year>2024</year></pub-date><volume>29</volume><issue>4</issue><issue-title xml:lang="en"/><issue-title xml:lang="ru"/><fpage>358</fpage><lpage>366</lpage><history><date date-type="received" iso-8601-date="2024-08-28"><day>28</day><month>08</month><year>2024</year></date><date date-type="accepted" iso-8601-date="2025-02-05"><day>05</day><month>02</month><year>2025</year></date></history><permissions><copyright-statement xml:lang="en">Copyright ©; 2024, Eco-Vector</copyright-statement><copyright-statement xml:lang="ru">Copyright ©; 2024, Эко-Вектор</copyright-statement><copyright-year>2024</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="2027-12-25"/><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://rjonco.com/1028-9984/article/view/635447">https://rjonco.com/1028-9984/article/view/635447</self-uri><abstract xml:lang="en"><p><bold>BACKGROUND<italic>:</italic></bold> The treatment of chondrosarcoma can be challenging due to the rarity of the tumor, the characteristics of the disease progression, and the variability of its anatomical location. Surgical resection of the tumor is not always feasible, particularly complete resection, due to its proximity to vital organs such as the spinal cord. The low cell sensitivity to chemotherapy and radiotherapy further limits treatment options and poses a poor prognosis. These factors contribute to a high incidence of local relapses, with their frequency reaching 58%. Particular emphasis is hereby placed on the recent advancements in high-dose chondrosarcoma irradiation using stereotactic radiotherapy, a technique that has been demonstrated to effectively overcome the radioresistance exhibited by malignant cells and thereby ensure the comprehensive eradication of the tumor.</p> <p><bold>DESCRIPTION OF CLINICAL CASE<italic>:</italic></bold> A female patient diagnosed with chondrosarcoma Th12 underwent Th11-12 laminectomy with the removal of an extratradural extramedullary tumor located on the anterior surface of the dural sac. Contrast-enhanced magnetic resonance imaging revealed a residual tumor two months post-surgery, accompanied by a clinical progression. The relapsed tumor bed was irradiated in a single dose of 9 Gy daily to a total dose of 45 Gy (116 Gy). Five months after the initiation of radiotherapy, a clinical improvement was observed, as evidenced by a decrease in pain on a visual analog scale. Furthermore, the dose of opioid analgesics was reduced. Objectively, based on magnetic resonance imaging findings, the disease stabilized. At the 13-month follow-up, a decrease in the lesion size was documented.</p> <p><bold>CONCLUSIONS<italic>:</italic></bold> Stereotactic radiotherapy for residual tumor following chondrosarcoma surgery has been demonstrated to stabilize the patient’s overall condition, reduce the necessity for opioid analgesics, enhance the patient’s quality of life, achieve partial regression of the tumor, and attain long-term disease remission.</p></abstract><trans-abstract xml:lang="ru"><p><bold>Обоснование.</bold> Лечение хондросаркомы (ХС) представляет собой сложную задачу ввиду редкости данной опухоли, особенностей течения заболевания и вариативности её локализации. Классическое хирургическое удаление злокачественного новообразования не всегда возможно, тем более в полном объёме, ввиду расположения опухоли вблизи таких жизненно важных структур, как спинной мозг, а низкая чувствительность клеток к химиотерапии и лучевой терапии ограничивает лечебные опции и ухудшает прогноз для пациента. Указанные особенности приводят к высоким показателям местных рецидивов, частота которых достигает 58%. Особое внимание привлекает современное высокодозное облучение ХС методом стереотаксической лучевой терапии, которая позволяет преодолеть порог радиорезистентности злокачественных клеток и обеспечивает радикализм лечения.</p> <p><bold>Описание клинического случая.</bold> Больная с диагнозом ХС Th12 получила хирургическое лечение в объёме ляминэктомии Th11-12, удаления экстраинтрадурального экстрамедуллярного новообразования передней поверхности дурального мешка. По результатам магнитно-резонансной томографии с контрастным усилением через 2 мес. от даты операции диагностирована остаточная опухоль, отмечалось клиническое ухудшение состояния пациентки. Проведено облучение ложа опухоли с рецидивом в разовой дозе 9 Гр ежедневно до суммарной дозы 45 Гр (116 изоГр). Спустя 5 мес после лучевой терапии отмечается клиническое улучшение, уменьшение болей по Визуальной аналоговой шкале, доза опиоидных анальгетиков снижена, объективно по данным магнитно-резонансной томографии стабилизация заболевания, а через 13 мес. зарегистрировано уменьшение размеров образования.</p> <p><bold>Заключение.</bold> Проведение стереотаксической лучевой терапии остаточной опухоли после хирургического удаления ХС позволило стабилизировать общее состояние больной, уменьшить дозу опиоидных анальгетиков, улучшить качество жизни, добиться частичной регрессии опухоли и длительной ремиссии заболевания.</p></trans-abstract><kwd-group xml:lang="en"><kwd>chondrosarcoma</kwd><kwd>residual tumor</kwd><kwd>stereotactic radiotherapy</kwd><kwd>spine</kwd><kwd>SRT</kwd></kwd-group><kwd-group xml:lang="ru"><kwd>хондросаркома</kwd><kwd>остаточная опухоль</kwd><kwd>стереотаксическая лучевая терапия</kwd><kwd>позвоночник</kwd></kwd-group><funding-group/></article-meta></front><body></body><back><ref-list><ref id="B1"><label>1.</label><mixed-citation>Aliev MD, Sushentsov EA. 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