A Large Pericardial Cyst in the Left Cardiophrenic Causing Persistent Chest Pain and Cough: A Case Report.

BACKGROUND Pericardial cyst is a rare benign mass of the mediastinum. More than two-thirds of pericardial cysts are located in the right cardiophrenic angle and less than one-third in the left cardiophrenic angle. Most cases are asymptomatic and discovered incidentally during to thoracic imaging such as chest X-ray, CT scans, and transthoracic echocardiograms.