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Complete angiography vs right atriography. Diagnosis of pericardial effusion.

Two cases demonstrate that a falsely positive result indicating pericardial effusion can occur with right atriography. In one case a benign thymoma of the mediastinum was responsible for the thickened right atrial border. In the other an intracavitary right atrial thrombus repeatedly imitated a pericardial effusion. These experiences emphasize that unilateral processes involving the heart cannot be differentiated from pericardial effusions by right atriography. We recommend complete bilateral angiocardiography to allow comparison of both heart borders.