Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Again seen are diffuse , bilateral interstitial opacities , greater on the right than on the left , with central pulmonary vascular congestion and scattered bronchial wall thickening . The main pulmonary artery is enlarged , stable since prior examinations . There is likely a small left pleural effusion , persistent since prior examinations . Ill - defined opacity in the right upper lung is likely a combination of Fissural fluid and adjacent atelectasis . Retrocardiac opacity may represent atelectasis , though infection is not excluded . A hiatal hernia is present . No pneumothorax is seen . Rightward tracheal deviation may be positional .
    OUTPUT:
    
1 . Bilateral interstitial abnormalities relatively similar to prior examinations with small right fissural fluid and left pleural effusion may be consistent with mild edema .