[Fistula between aorta and left atrium due to bacterial endocarditis in a patient with biological aortic valve - a case report].

Bacterial endocarditis of the aortic valve may lead to aortic regurgitation, or the aortic wall may become affected with perforation into the right atrium, right ventricle, or left ventricle. Perforation from the aorta into the left atrium forming an aorto-left atrial fistula is rare, and diagnosis is difficult because it closely mimics the features of mitral incompetence (Kay et al., 1959). This problem is illustrated by the present case.