Pericardial diverticula are focal out-pouchings arising from the pericardium. They are differentiated from congenital pericardial cysts by the presence of direct communication with the pericardial cavity. They can be radiologically-identical to cysts and can be hard to distinguish from pericardial cysts, bronchogenic cysts or thymic cysts if in an unusual location. They can change in size related to body position, with symptoms related to the change in position of the patient.
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