Double shadow behind right atrium and straightening of left main bronchus indicates -
Right atrium enlargement
Right ventricle enlargement
Left atrium enlargement
Left ventricle enlargement
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
Cardiovascular system