Abstract
Objective: To report the clinical case of a patient with Mitro-Aortic Intervalvar Fibrous Pseudoaneurysm (PFIMA) with acute mitral regurgitation, as well as clinical treatment, diagnostic methods and definitive treatment employed. Case details: This is a case study approved by the Research Ethics Committee (CEP) under opinion 2.696.862. An 18-year-old female patient, after presenting a clinical picture of acute heart failure, was diagnosed as having PFIMA by means of an echographic study with transthoracic echocardiography (ETT) and complemented with transesophageal echocardiography. Thus, there was a need to change the mitral valve for a mitral bioprosthesis that occurred in the same hospitalization without complications, being discharged soon after after control TTE. Final considerations: It is a rare clinical entity, of etiology resulting from cardiac surgery or endocarditis, in most cases, or are considered congenital because they have no defined cause. Complications are the main concern, since it can complicate with various entities and with this, the patient's death can occur, especially if it is not recognized early and properly treated.