Preoperative diagnosis of pathologic intracardiac structures by noninv
asive techniques is sometimes difficult or even impossible. In these c
ases a heart operation is required with opening of one or more cardiac
chambers. We demonstrate direct visualization of the left ventricular
cavity by transaortic cardioscopy in a patient with a pathologic intr
aventricular structure. With this technique we could avoid ventriculot
omy.