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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">Pediatric Hematology/Oncology and Immunopathology</journal-id><journal-title-group><journal-title xml:lang="en">Pediatric Hematology/Oncology and Immunopathology</journal-title><trans-title-group xml:lang="ru"><trans-title>Вопросы гематологии/онкологии и иммунопатологии в педиатрии</trans-title></trans-title-group></journal-title-group><issn publication-format="print">1726-1708</issn><issn publication-format="electronic">2414-9314</issn><publisher><publisher-name xml:lang="en">Fund Doctors, Innovations, Science for Children</publisher-name></publisher></journal-meta><article-meta><article-id pub-id-type="publisher-id">759</article-id><article-id pub-id-type="doi">10.24287/1726-1708-2023-22-4-144-150</article-id><article-categories><subj-group subj-group-type="toc-heading" xml:lang="en"><subject>CLINICAL OBSERVATIONS</subject></subj-group><subj-group subj-group-type="toc-heading" xml:lang="ru"><subject>КЛИНИЧЕСКИЕ НАБЛЮДЕНИЯ</subject></subj-group><subj-group subj-group-type="article-type"><subject></subject></subj-group></article-categories><title-group><article-title xml:lang="en">Growing teratoma syndrome in an adolescent with a testicular germ cell tumor: a case report</article-title><trans-title-group xml:lang="ru"><trans-title>Клинический случай синдрома растущей тератомы у подростка с герминогенной опухолью яичка</trans-title></trans-title-group></title-group><contrib-group><contrib contrib-type="author"><contrib-id contrib-id-type="orcid">https://orcid.org/0009-0007-4620-0568</contrib-id><name-alternatives><name xml:lang="en"><surname>Kalimullin</surname><given-names>B. A.</given-names></name><name xml:lang="ru"><surname>Калимуллин</surname><given-names>Б. А.</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><bio xml:lang="en"><p>Bulat A. Kalimullin, a pediatric oncologist at the Department of Hematopoietic Stem Cell Transplantation</p><p>140 Orenburgsky Tract St., Kazan 420138</p></bio><bio xml:lang="ru"><p>Калимуллин Булат Азатович, врач-детский онколог отделения трансплантации гемопоэтических стволовых клеток</p><p>420138, Казань, Оренбургский тракт, 140</p></bio><email>diongiran@mail.ru</email><xref ref-type="aff" rid="aff1"/></contrib><contrib contrib-type="author"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0001-9833-5156</contrib-id><name-alternatives><name xml:lang="en"><surname>Osipova</surname><given-names>I. V.</given-names></name><name xml:lang="ru"><surname>Осипова</surname><given-names>И. В.</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><bio xml:lang="en"><p>Kazan </p></bio><bio xml:lang="ru"><p>Казань</p></bio><email>ivos29@mail.ru</email><xref ref-type="aff" rid="aff1"/></contrib><contrib contrib-type="author"><contrib-id contrib-id-type="orcid">https://orcid.org/0009-0000-6318-1003</contrib-id><name-alternatives><name xml:lang="en"><surname>Shapiro</surname><given-names>V. Yu.</given-names></name><name xml:lang="ru"><surname>Шапиро</surname><given-names>В. Ю.</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><bio xml:lang="en"><p>Kazan </p></bio><bio xml:lang="ru"><p>Казань</p></bio><email>sh.valery@mail.ru</email><xref ref-type="aff" rid="aff1"/></contrib><contrib contrib-type="author"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0002-5308-6544</contrib-id><name-alternatives><name xml:lang="en"><surname>Talypov</surname><given-names>S. R.</given-names></name><name xml:lang="ru"><surname>Талыпов</surname><given-names>С. Р.</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><bio xml:lang="en"><p>Moscow</p></bio><bio xml:lang="ru"><p>Москва</p></bio><email>riumych@yandex.ru</email><xref ref-type="aff" rid="aff2"/></contrib><contrib contrib-type="author"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0003-0368-2708</contrib-id><name-alternatives><name xml:lang="en"><surname>Mitrofanova</surname><given-names>A. M.</given-names></name><name xml:lang="ru"><surname>Митрофанова</surname><given-names>А. М.</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><bio xml:lang="en"><p>Moscow</p></bio><bio xml:lang="ru"><p>Москва</p></bio><email>pathmorf@mail.ru</email><xref ref-type="aff" rid="aff2"/></contrib></contrib-group><aff-alternatives id="aff1"><aff><institution xml:lang="en">Children's Republican Clinical Hospital of Ministry of Healthcare of the Republic of Tatarstan</institution></aff><aff><institution xml:lang="ru">ГАУЗ «Детская республиканская клиническая больница» Минздрава Республики Татарстан</institution></aff></aff-alternatives><aff-alternatives id="aff2"><aff><institution xml:lang="en">Dmitry Rogachev National Medical Research Center of Pediatric Hematology, Oncology and Immunology of Ministry of Healthcare of the Russian Federation</institution></aff><aff><institution xml:lang="ru">ФГБУ «Национальный медицинский исследовательский центр детской гематологии, онкологии и иммунологии им. Дмитрия Рогачева» Минздрава России</institution></aff></aff-alternatives><pub-date date-type="pub" iso-8601-date="2023-12-20" publication-format="electronic"><day>20</day><month>12</month><year>2023</year></pub-date><volume>22</volume><issue>4</issue><issue-title xml:lang="en"/><issue-title xml:lang="ru"/><fpage>144</fpage><lpage>150</lpage><history><date date-type="received" iso-8601-date="2023-09-15"><day>15</day><month>09</month><year>2023</year></date><date date-type="accepted" iso-8601-date="2023-11-17"><day>17</day><month>11</month><year>2023</year></date></history><permissions><copyright-statement xml:lang="en">Copyright ©; 2023, «D. Rogachev NMRCPHOI»</copyright-statement><copyright-statement xml:lang="ru">Copyright ©; 2023, ФГБУ «НМИЦ ДГОИ им. Дмитрия Рогачева» Минздрава России</copyright-statement><copyright-year>2023</copyright-year><copyright-holder xml:lang="en">«D. Rogachev NMRCPHOI»</copyright-holder><copyright-holder xml:lang="ru">ФГБУ «НМИЦ ДГОИ им. Дмитрия Рогачева» Минздрава России</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://hemoncim.com/jour/article/view/759">https://hemoncim.com/jour/article/view/759</self-uri><abstract xml:lang="en"><p>Growing teratoma syndrome (GTS) is a condition characterized by a paradoxical increase in tumor size during or after chemotherapy and/or surgical treatment for germ cell tumors. Due to its relative rarity, GTS may be misinterpreted as disease progression. However, a decrease in tumor markers (alpha-fetoprotein (AFP) and human chorionic gonadotropin (hCG)) in the blood, a paradoxical increase in tumor size during chemotherapy, and a verified histological diagnosis of mature teratoma after the tumor removal confirm GTS. Here we report a clinical case of a patient in whom we observed a decrease in tumor markers (AFP and hCG) in the blood during treatment, a paradoxical increase in the tumor size and normal AFP and hCG levels 5 months after the end of chemotherapy and a histologically verified diagnosis. These clinical features are consistent with the diagnostic criteria of GTS. The patient's parents gave consent to the use of their child's data, including photographs, for research purposes and in publications.</p></abstract><trans-abstract xml:lang="ru"><p>Синдром растущей тератомы (СРТ) – состояние, характеризующееся парадоксальным увеличением размеров опухоли на фоне или после химиотерапевтического и/или хирургического лечения по поводу герминогенноклеточных опухолей. СРТ ввиду своей относительной редкости может ошибочно интерпретироваться как прогрессирование заболевания. Однако снижение уровня онкомаркеров альфа-фетопротеина (a-ФП) и хорионического гонадотропина человека (ХГЧ) в крови, парадоксальное увеличение размеров опухоли на фоне полихимиотерапии и верифицированный гистологический диагноз зрелой тератомы после удаления опухоли подтверждают СРТ. Приводим описание клинического наблюдения пациента, у которого наблюдается снижение уровня онкомаркеров a-ФП и ХГЧ в крови на фоне лечения, парадоксальное увеличение размеров опухоли спустя 5 мес после завершения полихимиотерапии при нормальных уровнях a-ФП, ХГЧ при гистологически подтвержденном диагнозе, что демонстрирует СРТ. Родители пациента дали согласие на использование информации, в том числе фотографий ребенка, в научных исследованиях и публикациях.</p></trans-abstract><kwd-group xml:lang="en"><kwd>growing teratoma syndrome</kwd><kwd>children</kwd><kwd>adolescents</kwd><kwd>germ cell tumor</kwd><kwd>embryonal carcinoma</kwd><kwd>mature teratoma</kwd></kwd-group><kwd-group xml:lang="ru"><kwd>синдром растущей тератомы</kwd><kwd>дети</kwd><kwd>подростки</kwd><kwd>герминогенноклеточная опухоль</kwd><kwd>эмбриональная карцинома</kwd><kwd>зрелая тератома</kwd></kwd-group><funding-group/></article-meta></front><body></body><back><ref-list><ref id="B1"><label>1.</label><citation-alternatives><mixed-citation xml:lang="en">1. [Электронный ресурс] Экстракраниальные герминогенно-клеточные опухоли. Клинические рекомендации. Национальное общество детских гематологов и онкологов. М.; 2020. URL: http://nodgo.org/sites/default/files/КР экстракраниальные герминогенно-клеточные опухоли дети 2020.pdf. 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