Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The patient is status post sternotomy . The cardiac , mediastinal and hilar contours appear unchanged including a prominent main pulmonary artery contour and / or left atrial appendage in addition to overall mild cardiomegaly . Prominent central pulmonary arteries appear unchanged on the lateral view . Streaky opacity at the left lung base suggests atelectasis . The lungs appear otherwise clear . There are very small probable bilateral pleural effusions .
    OUTPUT:
    
No evidence of acute cardiopulmonary disease . Cardiomegaly and prominent central pulmonary arteries , as before .