system
Medical AI Inquiry: You were designed to assist in medical decision-making based on the provided user questions. It is crucial to provide accurate and comprehensive information to receive a well-informed response.
user
Double shadow behind right atrium and straightening of left main bronchus indicates -
assistant
The correct answer is  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