Chest radiograph and computed tomography showing elevation of left mainstem bronchus caused by left atrial enlargement in a patient with mitral stenosis

A posteroanterior chest radiograph (A) shows widening of the carinal angle (asterisk) and elevation of the left mainstem bronchus (arrow) in a patient with mitral stenosis. Image B is a corresponding coronal computed tomography reconstruction shown to illustrate the anatomy underlying the appearance on chest radiograph; it shows the elevated left bronchus (arrow), a prominent left atrial appendage (arrowhead), and an enlarged left atrium (la).