<prompt> Earliest sign of left atrial enlargement is -Posterior displacement of esophagusWidening of carinal angleElevation of left bronchusDouble shadow of right border  <response>: Left atrial enlargement presents radiologically with elevation of left main bronchus which is the earlier feature ,splaying or widening of carina ,indentation and displacement of oesophagus posteriorly , double contour shadow density or double right hea border and prominent left atrial appendage. 