[Pseudoaneurysm of Mitral-aortic Intervalvular Fibrosa Due to the Detachment of Intracardiac Patch after Aortic Valve Replacement in a Patient with Infective Endocarditis]. 
A 67-year-old woman was referred to our hospital with a diagnosis of aortic stenosis.  As she had concurrent breast cancer, resection of the left breast was 1st performed.  She then suffered from infection of the breast wound followed by infective endocarditis.  She underwent aortic valve replacement(AVR) with a patch plasty of the perivalvular abscess in the mitral-aortic intervalvular fibrosa (MAIVF).  Four months after the AVR, severe aortic regurgitation occurred due to a pseudoaneurysm in the MAIVF and re-AVR was performed.  The surgery revealed detachment of the intra-cardiac patch caused perivalvular leakage.  Subsequently, the patient completely recovered following the redo surgery.