An<unk>  is a noncancerous tumor in the upper left or right side of the heart. It grows on the wall (atrial septum) that separates the two sides of the heart.
Atrial myxoma
Left ventricular aneurysm
Atrial fibrillation
Familial atrial fibrillation
Annuloaortic ectasia
Atrial flutter
Coronary artery aneurysm
Pericardial cyst