Aneurysm-like outpouching of ventricular wall through a gap caused by constrictive pericarditis with focal sparing.

Constrictive pericarditis is usually generalized though it can be focal, affecting only a patch of pericardium, or very rarely, generalized with focal sparing. We describe a case of constrictive pericarditis with focal sparing along the right ventricle. This focal sparing behaved like a defect in the otherwise thickened pericardium, resulting in protrusion of normal right ventricular myocardium between the margins of the thickened pericardium simulating an aneurysm.