Chest radiograph showing displacement of the esophagus by left atrial enlargement in a patient with mitral stenosis

A posteroanterior radiograph (A) shows a straightened left heart border with a prominent left atrial appendage (arrow) in a patient with left atrial enlargement caused by mitral stenosis. Image B is a lateral radiograph taken after the patient swallowed radiopaque contrast and shows compression of the lower esophagus by the enlarged left atrium (arrow).