Abstract
A 51 year-old male was referred to our department because of an abnormal chest X-ray, obtained during a routine physical examinaiton. The P-A chest film revealed an abnormally prominent right cardiac silhouette. A right decubitus film showed displacement of a portion of the right cardiac silhouette into the right hemithorax. On the basis of these findings, absence of the right pericardium seemed the most likely diagnosis. Non-selective pulmonary angiography demonstrated that the prominent silhouette was formed by the right atrium. This is the second case of pericardial defect on the right side in Japan and the thirteenth case in the world.
