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Initial transthoracic echocardiogram evaluation demonstrated a dilated cardiomyopathy with a suspicious mass. Multimodality imaging evaluation, including cardiac computed tomography and cardiac magnetic resonance imaging, confirmed the diagnosis of a Pseudoaneurysm of the Mitral-Aortic Intervalvular Fibrosa. Pseudoaneurysm of the Mitral-Aortic Intervalvular Fibrosa may be a potential congenital abnormality or a rare, life-threatening complication of aortic surgery or infective endocarditis. Recognition via multimodality imaging is essential to ensure adequate treatment.<\/jats:p>","DOI":"10.1093\/milmed\/usaf442","type":"journal-article","created":{"date-parts":[[2025,8,25]],"date-time":"2025-08-25T11:23:08Z","timestamp":1756120988000},"page":"e1734-e1738","source":"Crossref","is-referenced-by-count":0,"title":["Is That a Cardiac Mass or Just a Pseudoaneurysm of the Mitral-Aortic Intervalvular Fibrosa?"],"prefix":"10.1093","volume":"191","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-9937-0110","authenticated-orcid":false,"given":"Elizabeth R","family":"Doman","sequence":"first","affiliation":[{"name":"Department of Medicine, Cardiology, Brooke Army Medical Center , San Antonio, TX 78234,","place":["United States"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-4888-1209","authenticated-orcid":false,"given":"Emilio","family":"Fentanes","sequence":"additional","affiliation":[{"name":"Department of Medicine, Cardiology, 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