Left Atrial Enlargement in Chest Xray

CXR Findings in Left atrial enlargement
Convexity or straightening of the left atrial appendage just below the main pulmonary artery (along left heart border).
Double density sign: the right side of the enlarged left atrium pushes into the adjacent lung and creates an additional contour superimposed over the right heart.
Elevation of the left main bronchus and splaying of the carina.
Walking man sign on lateral projections.