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 marked enlargement of the main pulmonary artery . Interstitial opacification suggests mild pulmonary edema , but not nearly as severe as on the prior examination . There is , however , a focal right basilar opacity , for which atelectasis or pneumonia may be considered . It is difficult to exclude small pleural effusions . ]
    OUTPUT:
    
Findings suggesting mild pulmonary edema , although not nearly as severe as on the prior study . Suspicion for developing right basilar opacity , which may be compatible with atelectasis or pneumonia . Marked enlargement of the main pulmonary artery .