Giant coronary aneurysm diagnosed as incidental mediastinal mass.

A 41-year-old man with epigastric pain and nephrolithiasis was found to have an incidental large anterior mediastinal mass on computed tomography ([Figure 1A][1]). Transthoracic echocardiography was suggestive of a giant coronary aneurysm (GCA) versus pericardial cyst ([Figure 1B][1], [Online