<unk> s can be congenital or acquired, with the majority being congenital. Congenital<unk> s happen due to an abnormality in the development of the<unk>  sac that creates a bulge which is walled off to form a<unk> . Acquired<unk> s can be caused by inflammation from surgery, pericarditis, trauma, echinococcosis, tuberculosis, metastasis, or hemodialysis. The inflammation can lead to a walled-off pocket of fluid that is a<unk> .
Pericardial cyst
Cardiac myxoma
Annuloaortic ectasia
Crisscross heart
Overriding aorta
Cardiac fibroma
Pulmonary artery sling
Aortoesophageal fistula