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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">491</article-id><article-id pub-id-type="doi">10.24287/1726-1708-2021-20-1-156-159</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">Pseudotumor of the maxilla as first presentation of hemophilia B in a 1-year-old male</article-title><trans-title-group xml:lang="ru"><trans-title>Псевдоопухоль верхней челюсти у ребенка первого года жизни как первое проявление гемофилии В</trans-title></trans-title-group></title-group><contrib-group><contrib contrib-type="author"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0002-6839-3918</contrib-id><name-alternatives><name xml:lang="en"><surname>Kalinina</surname><given-names>M. P.</given-names></name><name xml:lang="ru"><surname>Калинина</surname><given-names>М. П.</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><bio xml:lang="en"><p>an otorhinolaryngologist at the Department of Oncology and Pediatric Surgery,</p><p>1 Samory Mashela St., Moscow 117997</p></bio><bio xml:lang="ru"><p>врач-оториноларинголог отделения онкологии и детской хирургии,</p><p>117997, Москва, ул. Саморы Машела, 1</p></bio><email>lormp@yandex.ru</email><xref ref-type="aff" rid="aff1"/></contrib><contrib contrib-type="author"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0002-2057-2036</contrib-id><name-alternatives><name xml:lang="en"><surname>Pshonkin</surname><given-names>A. V.</given-names></name><name xml:lang="ru"><surname>Пшонкин</surname><given-names>А. В.</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><xref ref-type="aff" rid="aff1"/></contrib><contrib contrib-type="author"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0002-4451-3233</contrib-id><name-alternatives><name xml:lang="en"><surname>Grachev</surname><given-names>N. S.</given-names></name><name xml:lang="ru"><surname>Грачёв</surname><given-names>Н. С.</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><xref ref-type="aff" rid="aff1"/></contrib><contrib contrib-type="author"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0001-5209-2099</contrib-id><name-alternatives><name xml:lang="en"><surname>Poletaev</surname><given-names>A. V.</given-names></name><name xml:lang="ru"><surname>Полетаев</surname><given-names>А. В.</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><xref ref-type="aff" rid="aff1"/></contrib><contrib contrib-type="author"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0003-4567-1871</contrib-id><name-alternatives><name xml:lang="en"><surname>Fedorova</surname><given-names>D. V.</given-names></name><name xml:lang="ru"><surname>Федорова</surname><given-names>Д. В.</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><xref ref-type="aff" rid="aff1"/></contrib><contrib contrib-type="author"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0003-4384-6754</contrib-id><name-alternatives><name xml:lang="en"><surname>Zharkov</surname><given-names>P. A.</given-names></name><name xml:lang="ru"><surname>Жарков</surname><given-names>П. А.</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><bio xml:lang="ru"><p>Москва</p></bio><xref ref-type="aff" rid="aff2"/></contrib></contrib-group><aff-alternatives id="aff1"><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><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"></institution></aff></aff-alternatives><pub-date date-type="pub" iso-8601-date="2021-04-21" publication-format="electronic"><day>21</day><month>04</month><year>2021</year></pub-date><volume>20</volume><issue>1</issue><issue-title xml:lang="en"/><issue-title xml:lang="ru"/><fpage>156</fpage><lpage>159</lpage><history><date date-type="received" iso-8601-date="2021-04-20"><day>20</day><month>04</month><year>2021</year></date><date date-type="accepted" iso-8601-date="2021-04-20"><day>20</day><month>04</month><year>2021</year></date></history><permissions><copyright-statement xml:lang="en">Copyright ©; 2021, «D. Rogachev NMRCPHOI»</copyright-statement><copyright-statement xml:lang="ru">Copyright ©; 2021, ФГБУ «НМИЦ ДГОИ им. Дмитрия Рогачева» Минздрава России</copyright-statement><copyright-year>2021</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/491">https://hemoncim.com/jour/article/view/491</self-uri><abstract xml:lang="en"><p>Pseudotumor is a rare complication of hemophilia with a prevalence 1–2% of all clinical cases. Commonly bone lesions affect long tubular bones, the pelvis, wrist and foot bones. According to world science literature only 16 cases of maxilla bone lesions in patients with hemophilia were found. This article describes a clinical case of maxilla pathological lesion with the destruction of facial skeleton bones in a one year old boy. The differential diagnosis included malignant and benign neoplasia, inflammatory processes. During laboratory examination a deficiency of IX coagulation factor was revealed and the patient was diagnosed with hemophilia В. The patient underwent surgical treatment by removing the lesion with specific replacement therapy; an intraosseous organizing hematoma was verified. The maxilla pseadotumor in this child was a manifestation of hemophilia. The patient's parents agreed to use the information, including the child's photo, in scientific research and publications. </p></abstract><trans-abstract xml:lang="ru"><p>Псевдоопухоль (ПО) – редкое осложнение гемофилии, возникающее не более чем в 1–2% случаев. Наиболее часто поражаются длинные трубчатые кости, кости таза, кистей и стоп. В мировой литературе описано 16 пациентов с поражением в области верхней челюсти при гемофилии. В статье приводится клинический случай наблюдения патологического образования с поражением верхней челюсти и деструкцией костей лицевого скелета у годовалого мальчика. Дифференциальный диагноз пациента включал злокачественные и доброкачественные образования верхней челюсти, воспалительные процессы. При обследовании ребенка был выявлен дефицит IX фактора свертывания и установлен диагноз: гемофилия В. Пациенту проведена операция по удалению образования на фоне специфической заместительной терапии и верифицирована внутрикостная организующаяся гематома. ПО верхней челюсти у ребенка была первым проявлением гемофилии. Родители пациента дали согласие на использование информации, в том числе фото ребенка, в научных исследованиях и публикациях. </p></trans-abstract><kwd-group xml:lang="en"><kwd>pseudotumor</kwd><kwd>hemophilia A</kwd><kwd>hemophilia B</kwd><kwd>lesion of the maxilla</kwd><kwd>children</kwd></kwd-group><kwd-group xml:lang="ru"><kwd>псевдоопухоль</kwd><kwd>гемофилия А</kwd><kwd>гемофилия В</kwd><kwd>поражение верхней челюсти</kwd><kwd>дети</kwd></kwd-group><funding-group/></article-meta></front><body></body><back><ref-list><ref id="B1"><label>1.</label><mixed-citation>Starker L. Knochenusur durch ein hamophiles, subperiostales Hamatom. Mitt Grenzgeb Med Chir 1918; 31: 381– 415.</mixed-citation></ref><ref id="B2"><label>2.</label><mixed-citation>Ahlberg A.K. On the natural history of hemophilic pseudotumor. J Bone Joint Surg Am 1975; 57 (8): 1133–6.</mixed-citation></ref><ref id="B3"><label>3.</label><mixed-citation>Gilbert M.S. Characterizing the hemophilic pseudotumor. 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