The authors report a case of a patient with postoperative perimitral b
ioprosthetic abscess and probable systemic embolization. The location
of the abscess is not common and the use of porcine bioprostheses is s
upposedly associated with a low rate of embolic complications. Because
of the high mortality and morbidity, it is stressed that patients wit
h prosthetic valve endocarditis should be managed aggressively with su
rgery.