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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">problendo</journal-id><journal-title-group><journal-title xml:lang="ru">Проблемы Эндокринологии</journal-title><trans-title-group xml:lang="en"><trans-title>Problems of Endocrinology</trans-title></trans-title-group></journal-title-group><issn pub-type="ppub">0375-9660</issn><issn pub-type="epub">2308-1430</issn><publisher><publisher-name>Endocrinology Research Centre</publisher-name></publisher></journal-meta><article-meta><article-id pub-id-type="doi">10.14341/probl13125</article-id><article-id custom-type="elpub" pub-id-type="custom">problendo-13125</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>Клиническая эндокринология</subject></subj-group><subj-group subj-group-type="section-heading" xml:lang="en"><subject>Clinical endocrinology</subject></subj-group></article-categories><title-group><article-title>Синдром гипокальциурической гиперкальциемии. Редкость ли? Два клинических случая в амбулаторной практике</article-title><trans-title-group xml:lang="en"><trans-title>Syndrome of hypocalсiuric hypercalcemia. Is it rare? Two clinical cases in an outpatient clinic</trans-title></trans-title-group></title-group><contrib-group><contrib contrib-type="author" corresp="yes"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0001-7005-431X</contrib-id><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Свиридонова</surname><given-names>М. А.</given-names></name><name name-style="western" xml:lang="en"><surname>Sviridonova</surname><given-names>M. A.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Свиридонова Марина Александровна – кандидат медицинских наук.</p><p>125124, Москва, 1-я улица Ямского Поля, д. 15, с. 4.</p><p>SPIN-код: 3717-2510</p></bio><bio xml:lang="en"><p>Marina A. Sviridonova - MD, PhDю</p><p>125124, 15/4 1th street Yamskogo Polya, Moscow.</p><p>SPIN-код: 3717-2510</p></bio><email xlink:type="simple">marsendoc@gmail.com</email><xref ref-type="aff" rid="aff-1"/></contrib></contrib-group><aff-alternatives id="aff-1"><aff xml:lang="ru"><institution>Общество с ограниченной ответственностью «Огни Олимпа»</institution><country>Россия</country></aff><aff xml:lang="en"><institution>LLC “Ogni Olimpa”</institution><country>Russian Federation</country></aff></aff-alternatives><pub-date pub-type="collection"><year>2022</year></pub-date><pub-date pub-type="epub"><day>17</day><month>06</month><year>2022</year></pub-date><volume>68</volume><issue>5</issue><fpage>24</fpage><lpage>31</lpage><permissions><copyright-statement>Copyright &amp;#x00A9; Свиридонова М.А., 2022</copyright-statement><copyright-year>2022</copyright-year><copyright-holder xml:lang="ru">Свиридонова М.А.</copyright-holder><copyright-holder xml:lang="en">Sviridonova M.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://www.probl-endojournals.ru/jour/article/view/13125">https://www.probl-endojournals.ru/jour/article/view/13125</self-uri><abstract><p>Синдром гипокальциурической гиперкальциемии (Familial hypocalciuric hypercalcemia, FHH) является наследственным заболеванием, в основе которого лежит дисфункция кальций-чувствительного рецептора или ассоциированных с ним белковых комплексов. По последним данным, распространенность этого состояния может быть сопоставимой с частотой первичного гиперпаратиреоза. Клинические проявления FHH, как правило, отсутствуют, но в ряде случаев могут отмечаться классические симптомы гиперкальциемии. Своевременная дифференциальная диагностика FHH позволяет избежать дорогостоящего инструментального обследования, а также необоснованного хирургического лечения. Представленные в данной публикации клинические случаи демонстрируют неоправданные сложности в этом вопросе и необходимость повышения информированности врачей о синдроме семейной гипокальциурической гиперкальциемии.</p></abstract><trans-abstract xml:lang="en"><p>Hypocalciuric hypercalcemia syndrome (familial hypocalciuric hypercalcemia, FHH) is an inherited condition based on dysfunction of the calcium receptor or its associated partner proteins. Recent evidence suggests that the prevalence of this condition may be comparable to that of primary hyperparathyroidism. Clinical manifestations of FHH are usually absent; however the classic symptoms of hypercalcemia may be present in some cases. Timely differential diagnosis of FHH avoids unnecessary and expensive instrumental examination, as well as ineffective treatment. The clinical cases presented in this publication demonstrate the unjustified difficulties in this issue and the necessity to raise the awareness of physicians about the familial hypocalciuric hypercalcemia.</p></trans-abstract><kwd-group xml:lang="ru"><kwd>семейная гипокальциурическая гиперкальциемия</kwd><kwd>кальций-чувствительный рецептор</kwd><kwd>CASR</kwd><kwd>первичный гиперпаратиреоз</kwd></kwd-group><kwd-group xml:lang="en"><kwd>familial hypocalciuric hypercalcemia</kwd><kwd>calcium-sensitive receptor</kwd><kwd>CASR</kwd><kwd>primary hyperparathyroidism</kwd></kwd-group></article-meta></front><back><ref-list><ref id="cit1"><mixed-citation publication-type="commun" publication-format="web"><name><surname>Mokrysheva</surname> <given-names>N.G.</given-names></name>, <name><surname>Eremkina</surname> <given-names>A.K.</given-names></name>, <name><surname>Mirnaya</surname> <given-names>S.S.</given-names></name>, i dr. <article-title>Klinicheskie rekomendatsii po pervichnomu giperparatireozu, kratkaya versiya</article-title> // <source>Problemy Endokrinologii.</source> — <year>2021</year>. — T. <volume>67</volume>. — №<month>4</month>. — <fpage>94</fpage>-<lpage>124</lpage>. doi: https://doi.org/<object-id pub-id-type="doi" specific-use="metadata">10.14341/probl12801</object-id></mixed-citation></ref><ref id="cit2"><element-citation><name><surname>Yeh</surname> <given-names>Michael W.</given-names> </name> <name><surname>Ituarte</surname> <given-names>Philip H. 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