Bibliogr. s. 87-88

Background: The entity pseudoaneurysm arising from the mitral aortic intervalvular fibrosa (P-MAIVF) is a rare cardiac finding caused by multiple factors. This entity is usually diagnosed with echocardiography and confirmed with cardiac computed tomography (CT). Case Report: We presented a case of congenital P-MAIVF communicating with the left atrium (LA) and an aberrant right subclavian artery, misdiagnosed as primary mitral regurgitation (MR) in transthoracic echocardiogram (TTE) due to relative contraindications to transesophageal echocardiogram (TEE), revealed in a hemophilic patient, and diagnosed with cardiac CT. Conclusions: In conclusion, cardiac CT plays a definitive role not only in anatomical assessment and confirmation of the lesion but also in primary diagnostics in patients suspected of MAIVF - especially those with relative and absolute contraindications to TEE.