Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: There is a very mild interstitial abnormality including peribronchial cuffing , an appearance which may be associated with mild congestion among other causes . Otherwise , the lungs appear clear . The heart is mildly enlarged . The patient is status post aortic valve replacement with sternotomy . There is no pleural effusion or pneumothorax . Bony structures are unremarkable .
    OUTPUT:
    
Slight interstitial abnormality which , in overall context , probably reflects mild pulmonary vascular congestion , although atypical infection or bronchial inflammation could have a similar appearance .