Pseudoaneurysm in the mitral aortic intervalvular fibrosa (MAIVF) is a rare but potentially catastrophic complication of the aortic valve endocarditis, aortic valve surgery or chest trauma. We describe a case of pseudoaneurysm in the MAIVF with fistulous connection to the left atrium in a 55-year-old woman with native aortic valve endocarditis. The diagnosis was confirmed using transesophageal echocardiography and she recovered her health through surgical correction.