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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="ru"><front><journal-meta><journal-id journal-id-type="publisher-id">nodgo</journal-id><journal-title-group><journal-title xml:lang="ru">Российский журнал детской гематологии и онкологии (РЖДГиО)</journal-title><trans-title-group xml:lang="en"><trans-title>Russian Journal of Pediatric Hematology and Oncology</trans-title></trans-title-group></journal-title-group><issn pub-type="ppub">2311-1267</issn><issn pub-type="epub">2413-5496</issn><publisher><publisher-name>LTD “Graphica”</publisher-name></publisher></journal-meta><article-meta><article-id pub-id-type="doi">10.21682/2311-1267-2022-9-3-90-92</article-id><article-id custom-type="elpub" pub-id-type="custom">nodgo-862</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="ru"><subject>КЛИНИЧЕСКИЕ НАБЛЮДЕНИЯ</subject></subj-group><subj-group subj-group-type="section-heading" xml:lang="en"><subject>CLINICAL CASES</subject></subj-group></article-categories><title-group><article-title>Приобретенная гемофилия А с внутримышечной гематомой в необычном возрасте: клинический случай</article-title><trans-title-group xml:lang="en"><trans-title>Acquired hemophilia A with intramuscular hematoma at an unusual age: a case report</trans-title></trans-title-group></title-group><contrib-group><contrib contrib-type="author" corresp="yes"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0002-4320-7509</contrib-id><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Nourbakhsh</surname><given-names>S.M.K.</given-names></name><name name-style="western" xml:lang="en"><surname>Nourbakhsh</surname><given-names>S.M.K.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Department of Pediatric Hematology and Oncology, Imam Khomeini Hospital Complex</p><p>Keshavarz Blvd., Tehran, Iran 14197-33141</p></bio><bio xml:lang="en"><p>Seyed Mohammad Kazem Nourbakhsh: MD, Associate Professor of Pediatric Hematology and Oncology, Department of Pediatric Hematology and Oncology, Imam Khomeini Hospital Complex</p><p>Keshavarz Blvd., Tehran, 14197-33141</p></bio><email xlink:type="simple">dr.nourbakhsh2010@gmail.com</email><xref ref-type="aff" rid="aff-1"/></contrib><contrib contrib-type="author" corresp="yes"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0002-7106-9799</contrib-id><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Bahadoram</surname><given-names>M.</given-names></name><name name-style="western" xml:lang="en"><surname>Bahadoram</surname><given-names>M.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Thalassemia and Hemoglobinopathy Research Center</p><p>Golestan St., Ahvaz, Iran 15794–61357</p></bio><bio xml:lang="en"><p>Bahadoram Mohammad: MD, Researcher, Thalassemia and Hemoglobinopathy Research Center</p><p>Golestan St., Ahvaz, 15794–61357</p></bio><email xlink:type="simple">mohammadbahadoram@yahoo.com</email><xref ref-type="aff" rid="aff-2"/></contrib><contrib contrib-type="author" corresp="yes"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0002-7151-4805</contrib-id><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Eskandarion</surname><given-names>S.</given-names></name><name name-style="western" xml:lang="en"><surname>Eskandarion</surname><given-names>S.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Department of Pediatric Hematology and Oncology, Imam Khomeini Hospital Complex</p><p>Keshavarz Blvd., Tehran, Iran 14197-33141</p></bio><bio xml:lang="en"><p>Sahar Eskandarion: MD, Pediatrician, Department of Pediatric Hematology and Oncology, Imam Khomeini Hospital Complex</p><p>Keshavarz Blvd., Tehran, 14197-33141</p></bio><email xlink:type="simple">Sahar.eskandarion@tums.ac.ir</email><xref ref-type="aff" rid="aff-1"/></contrib><contrib contrib-type="author" corresp="yes"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0002-5091-5191</contrib-id><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Hassanzadeh</surname><given-names>S.</given-names></name><name name-style="western" xml:lang="en"><surname>Hassanzadeh</surname><given-names>S.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Thalassemia and Hemoglobinopathy Research Center</p><p>Golestan St., Ahvaz, Iran 15794–61357</p></bio><bio xml:lang="en"><p>Shakiba Hassanzadeh: MD, Researcher, Thalassemia and Hemoglobinopathy Research Center</p><p>Golestan St., Ahvaz, 15794–61357</p></bio><email xlink:type="simple">shak.hassanzadeh@gmail.com</email><xref ref-type="aff" rid="aff-2"/></contrib></contrib-group><aff-alternatives id="aff-1"><aff xml:lang="ru"><institution>Tehran University of Medical Sciences</institution><country>Иран</country></aff><aff xml:lang="en"><institution>Tehran University of Medical Sciences</institution><country>Islamic Republic of Iran</country></aff></aff-alternatives><aff-alternatives id="aff-2"><aff xml:lang="ru"><institution>Health Research Institute, Ahvaz Jundishapur University of Medical Sciences</institution><country>Иран</country></aff><aff xml:lang="en"><institution>Health Research Institute, Ahvaz Jundishapur University of Medical Sciences</institution><country>Islamic Republic of Iran</country></aff></aff-alternatives><pub-date pub-type="collection"><year>2022</year></pub-date><pub-date pub-type="epub"><day>09</day><month>11</month><year>2022</year></pub-date><volume>9</volume><issue>3</issue><fpage>90</fpage><lpage>92</lpage><permissions><copyright-statement>Copyright &amp;#x00A9; Nourbakhsh S., Bahadoram M., Eskandarion S., Hassanzadeh S., 2022</copyright-statement><copyright-year>2022</copyright-year><copyright-holder xml:lang="ru">Nourbakhsh S., Bahadoram M., Eskandarion S., Hassanzadeh S.</copyright-holder><copyright-holder xml:lang="en">Nourbakhsh S., Bahadoram M., Eskandarion S., Hassanzadeh S.</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://journal.nodgo.org/jour/article/view/862">https://journal.nodgo.org/jour/article/view/862</self-uri><abstract><p>.</p></abstract><trans-abstract xml:lang="en"><sec><title>Background</title><p>Background. Acquired factor VIII (FVIII) deficiency or acquired hemophilia A (AHA) is very uncommon in children. Patients with AHA usually present with abnormal or unexpected bleeding which may be life-threatening. These patients usually have unexplained, prolonged, and isolated activated partial thromboplastin time (aPTT). Consequently, FVIII activity should be immediately evaluated. Bleeding prevention is important in patients with AHA.</p></sec><sec><title>Case report</title><p>Case report. We present a case of a previously healthy 13-year-old female who presented with intramuscular hematoma, soft tissue hemorrhage, and epistaxis who was eventually diagnosed with AHA.</p></sec><sec><title>Conclusion</title><p>Conclusion. To our knowledge, the present report is one of the few reported cases of an Asian patient that was diagnosed with acquired hemophilia A at a young age.</p></sec></trans-abstract><kwd-group xml:lang="en"><kwd>acquired hemophilia A</kwd><kwd>acquired FVIII deficiency</kwd><kwd>factor VIII</kwd><kwd>bleeding</kwd><kwd>aPTT prolongation</kwd></kwd-group><funding-group><funding-statement xml:lang="en">We would also like to thank Tehran University of Medical Sciences (Tehran, Iran) for their financial support.</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">Collins P.W., Percy C.L. Advances in the understanding of acquired haemophilia A: implications for clinical practice. Br J Haematol. 2010;148(2):183–94. doi: 10.1111/j.1365-2141.2009.07915.x.</mixed-citation><mixed-citation xml:lang="en">Collins P.W., Percy C.L. 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