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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">jsms</journal-id><journal-title-group><journal-title xml:lang="ru">Journal of Siberian Medical Sciences</journal-title><trans-title-group xml:lang="en"><trans-title>Journal of Siberian Medical Sciences</trans-title></trans-title-group></journal-title-group><issn pub-type="ppub">2542-1174</issn><publisher><publisher-name>Federal state budgetary educational institution of higher education "Novosibirsk state medical university" of  Ministry of Health of the Russian Federation (FSBEI HE NSMU MOH Russia)</publisher-name></publisher></journal-meta><article-meta><article-id custom-type="elpub" pub-id-type="custom">jsms-464</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>Статьи</subject></subj-group></article-categories><title-group><article-title></article-title><trans-title-group xml:lang="en"><trans-title>Leiomyosarcoma of the right atrium</trans-title></trans-title-group></title-group><contrib-group><contrib contrib-type="author" corresp="yes"><name-alternatives><name name-style="western" xml:lang="en"><surname>Shlyakhtina</surname><given-names>N. V.</given-names></name></name-alternatives><email xlink:type="simple">natashavkz@mail.ru</email><xref ref-type="aff" rid="aff-1"/></contrib><contrib contrib-type="author" corresp="yes"><name-alternatives><name name-style="western" xml:lang="en"><surname>Tsybina</surname><given-names>T. G.</given-names></name></name-alternatives><email xlink:type="simple">noemail@neicon.ru</email><xref ref-type="aff" rid="aff-2"/></contrib><contrib contrib-type="author" corresp="yes"><name-alternatives><name name-style="western" xml:lang="en"><surname>Bukhtij</surname><given-names>N. V.</given-names></name></name-alternatives><email xlink:type="simple">noemail@neicon.ru</email><xref ref-type="aff" rid="aff-2"/></contrib><contrib contrib-type="author" corresp="yes"><name-alternatives><name name-style="western" xml:lang="en"><surname>Spitsyna</surname><given-names>S. V.</given-names></name></name-alternatives><email xlink:type="simple">noemail@neicon.ru</email><xref ref-type="aff" rid="aff-2"/></contrib></contrib-group><aff xml:lang="en" id="aff-1"><institution>Novosibirsk Regional Clinical Cardiologic Dispensary; Novosibirsk State University</institution><country>Russian Federation</country></aff><aff xml:lang="en" id="aff-2"><institution>Novosibirsk Regional Clinical Cardiologic Dispensary</institution><country>Russian Federation</country></aff><pub-date pub-type="collection"><year>2017</year></pub-date><pub-date pub-type="epub"><day>04</day><month>06</month><year>2018</year></pub-date><volume>0</volume><issue>2</issue><fpage>18</fpage><lpage>21</lpage><permissions><copyright-statement>Copyright &amp;#x00A9; Shlyakhtina N.V., Tsybina T.G., Bukhtij N.V., Spitsyna S.V., 2018</copyright-statement><copyright-year>2018</copyright-year><copyright-holder xml:lang="ru">Shlyakhtina N.V., Tsybina T.G., Bukhtij N.V., Spitsyna S.V.</copyright-holder><copyright-holder xml:lang="en">Shlyakhtina N.V., Tsybina T.G., Bukhtij N.V., Spitsyna S.V.</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://jsms.elpub.ru/jour/article/view/464">https://jsms.elpub.ru/jour/article/view/464</self-uri><trans-abstract xml:lang="en"><p>The principal method for early diagnostics of cardiac tumors is echocardiography. Transesophageal echocardiography allows to determine more accurately localization of the growth, structure and flexibility, and also the degree of obstruction of AVvalves. We demonstrate a clinical case of leiomyosarcoma of the right atrium, its clinical manifestations were cardiac insufficiency, cardiac arrhythmia and pericardial effusion. Difficulties in diagnostics were connected with nonspecific complaints due to tumor localization and infiltration with tumoral tissue into the cardiac structures. Our clinical case is of interest because of rarity of pathology, difficulty of intravital diagnostics of disease and interpretation of nonspecific clinical picture.</p></trans-abstract><kwd-group xml:lang="ru"><kwd>Cardiac tumors</kwd><kwd>Leiomyosarcoma</kwd><kwd>Echocardiography</kwd></kwd-group></article-meta></front><back><ref-list><title>References</title><ref id="cit1"><label>1</label><citation-alternatives><mixed-citation xml:lang="ru">McManus B. (2011). 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