<unk>  is the outpouching of the parietal pericardium that is lined by mesothelial cells. It is usually unilocular. It is most commonly detected incidentally in asymptomatic patients. It's most common location is the right costophrenic angle
Pericardial cyst
Perforated septum
Left ventricular aneurysm
Annuloaortic ectasia
Overriding aorta
Atrial myxoma
Deviated septum
Aortic intramural hematoma