Double shadow behind right atrium and straightening of left main bronchus indicates -: (A) Right atrium enlargement, (B) Right ventricle enlargement, (C) Left atrium enlargement, (D) Left ventricle enlargement
Answer is C. Left atrial enlargement presents radiologically with elevation of left main bronchus ( earliest feature ) ,splaying or widening of carina ,displacement of oesophagus posteriorly ,double Right hea border and prominent left atrial appendage