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Echocardiography showed a mass of the left ventricle involving the mitral valve; cardiac <jats:styled-content style=\"fixed-case\">MRI<\/jats:styled-content> suggested acute endocarditis. Severe peripheral blood eosinophilia was found. Eosinophilic granulomatosis with polyangiitis was diagnosed; treatment with prednisone and cyclophosphamide was started. Despite the clinical improvement, severe mitral stenosis persisted, surgical treatment was planned. However, evaluation after 6 cycles of cyclophosphamide pulse therapy revealed a significant regression of the valvular disease.<\/jats:p>","DOI":"10.1111\/echo.14171","type":"journal-article","created":{"date-parts":[[2018,10,19]],"date-time":"2018-10-19T03:41:01Z","timestamp":1539920461000},"page":"2099-2103","update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":4,"title":["Severe mitral stenosis secondary to eosinophilic granulomatosis resolving after pharmacological treatment"],"prefix":"10.1111","volume":"35","author":[{"given":"Ewa","family":"Szczerba","sequence":"first","affiliation":[{"name":"First Chair and Department of Cardiology Medical University of Warsaw  Warsaw Poland"},{"name":"Department of Cardiology Institute of Mother and Child  Warsaw Poland"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Robert","family":"Kowalik","sequence":"additional","affiliation":[{"name":"First Chair and Department of 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