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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">rsp</journal-id><journal-title-group><journal-title xml:lang="ru">Научно-практическая ревматология</journal-title><trans-title-group xml:lang="en"><trans-title>Rheumatology Science and Practice</trans-title></trans-title-group></journal-title-group><issn pub-type="ppub">1995-4484</issn><issn pub-type="epub">1995-4492</issn><publisher><publisher-name>IMA-PRESS, LLC</publisher-name></publisher></journal-meta><article-meta><article-id pub-id-type="doi">10.47360/1995-4484-2025-407-414</article-id><article-id custom-type="elpub" pub-id-type="custom">rsp-3789</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>ОПИСАНИЕ СЛУЧАЯ</subject></subj-group><subj-group subj-group-type="section-heading" xml:lang="en"><subject>CASE DESCRIPTION</subject></subj-group></article-categories><title-group><article-title>Псевдотофусная форма болезни депонирования пирофосфата кальция: особенности диагностики и течения заболевания (описание клинического случая)</article-title><trans-title-group xml:lang="en"><trans-title>Pseudothophus form of calcium pyrophosphate deposition disease: Features of diagnosis and course of the disease (description of a clinical case)</trans-title></trans-title-group></title-group><contrib-group><contrib contrib-type="author" corresp="yes"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0002-2947-7334</contrib-id><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Шалыгина</surname><given-names>М. В.</given-names></name><name name-style="western" xml:lang="en"><surname>Shalygina</surname><given-names>M. V.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Шалыгина Мария Владимировна</p><p>115522, Москва, Каширское шоссе, 34а</p></bio><bio xml:lang="en"><p>Mariya V. Shalygina</p><p>115522, Moscow, Kashirskoye Highway, 34A</p></bio><email xlink:type="simple">shalygina_97@mail.ru</email><xref ref-type="aff" rid="aff-1"/></contrib><contrib contrib-type="author" corresp="yes"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0001-5285-8226</contrib-id><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Супрун</surname><given-names>М. Д.</given-names></name><name name-style="western" xml:lang="en"><surname>Suprun</surname><given-names>M. D.</given-names></name></name-alternatives><bio xml:lang="ru"><p>115522, Москва, Каширское шоссе, 34а</p></bio><bio xml:lang="en"><p>Marina D. Suprun</p><p>115522, Moscow, Kashirskoye Highway, 34A</p></bio><xref ref-type="aff" rid="aff-1"/></contrib><contrib contrib-type="author" corresp="yes"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0003-1191-5831</contrib-id><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Елисеев</surname><given-names>М. С.</given-names></name><name name-style="western" xml:lang="en"><surname>Eliseev</surname><given-names>M. S.</given-names></name></name-alternatives><bio xml:lang="ru"><p>115522, Москва, Каширское шоссе, 34а</p></bio><bio xml:lang="en"><p>Maxim S. Eliseev</p><p>115522, Moscow, Kashirskoye Highway, 34A</p></bio><xref ref-type="aff" rid="aff-1"/></contrib><contrib contrib-type="author" corresp="yes"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0002-1782-7763</contrib-id><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Семенова</surname><given-names>Л. А.</given-names></name><name name-style="western" xml:lang="en"><surname>Semyonova</surname><given-names>L. A.</given-names></name></name-alternatives><bio xml:lang="ru"><p>115522, Москва, Каширское шоссе, 34а; 107564, Москва, Яузская аллея, 2</p></bio><bio xml:lang="en"><p>Lyudmila A. Semyonova</p><p>115522, Moscow, Kashirskoye Highway, 34A; 107564, Moscow, Yauszkaya alley, 2</p></bio><xref ref-type="aff" rid="aff-2"/></contrib></contrib-group><aff-alternatives id="aff-1"><aff xml:lang="ru"><institution>ФГБНУ «Научно-исследовательский институт ревматологии им. В.А. Насоновой»</institution><country>Россия</country></aff><aff xml:lang="en"><institution>V.A. Nasonova Research Institute of Rheumatology</institution><country>Russian Federation</country></aff></aff-alternatives><aff-alternatives id="aff-2"><aff xml:lang="ru"><institution>ФГБНУ «Научно-исследовательский институт ревматологии им. В.А. Насоновой»; ФГБНУ «Центральный научно-исследовательский институт туберкулеза»</institution><country>Россия</country></aff><aff xml:lang="en"><institution>V.A. Nasonova Research Institute of Rheumatology; Central Tuberculosis Research Institute</institution><country>Russian Federation</country></aff></aff-alternatives><pub-date pub-type="collection"><year>2025</year></pub-date><pub-date pub-type="epub"><day>31</day><month>08</month><year>2025</year></pub-date><volume>63</volume><issue>4</issue><fpage>407</fpage><lpage>414</lpage><permissions><copyright-statement>Copyright &amp;#x00A9; Шалыгина М.В., Супрун М.Д., Елисеев М.С., Семенова Л.А., 2025</copyright-statement><copyright-year>2025</copyright-year><copyright-holder xml:lang="ru">Шалыгина М.В., Супрун М.Д., Елисеев М.С., Семенова Л.А.</copyright-holder><copyright-holder xml:lang="en">Shalygina M.V., Suprun M.D., Eliseev M.S., Semyonova L.A.</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://rsp.mediar-press.net/rsp/article/view/3789">https://rsp.mediar-press.net/rsp/article/view/3789</self-uri><abstract><p>Болезнь депонирования пирофосфата кальция (БДПК) – заболевание, протекающее под маской различных патологий и отличающееся разнообразием клинических форм. Одним из наиболее редких и диагностически сложных вариантов является хронический артрит с формированием периартикулярных отложений кристаллов пирофосфата кальция, имитирующих подагрические тофусы. В статье представлены клинический случай и анализ дифференциального диагноза пациента с псевдотофусной формой БДПК.</p></abstract><trans-abstract xml:lang="en"><p>Calcium pyrophosphate deposition disease (CPPD) is a disease that occurs under the guise of various diseases and is characterized by a variety of clinical forms. One of the most rare and diagnostically difficult variants is chronic arthritis with the formation of periarticular deposits of calcium pyrophosphate crystals, imitating gouty tophi. The article presents a clinical case and analysis of the differential diagnosis of a patient with a pseudo-tophaceous form of CPPD.</p></trans-abstract><kwd-group xml:lang="ru"><kwd>болезнь депонирования кристаллов пирофосфата кальция</kwd><kwd>кристаллы пирофосфата кальция</kwd><kwd>псевдотофус</kwd><kwd>поляризационная микроскопия</kwd></kwd-group><kwd-group xml:lang="en"><kwd>calcium pyrophosphate crystal deposition disease</kwd><kwd>calcium pyrophosphate crystals</kwd><kwd>pseudotophus</kwd><kwd>polarized light microscopy</kwd></kwd-group><funding-group><funding-statement xml:lang="ru">Статья подготовлена в рамках фундаментальной научной темы «Разработка междисциплинарной персонализированной модели оказания помощи пациентам с аутовоспалительными дегенеративными заболеваниями» № 1021051403074-2</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">Барскова ВГ, Ильина АЕ, Семенова ЛА, Раденска-Лоповок СГ, Осипянц МА, Смирнов АВ, и др. 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