Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The cardiac silhouette is normal . Low lung volumes accentuate the bronchovascular structures . Increased opacity at right lung base could reflect atelectasis or early developing pneumonia in the appropriate clinical setting . However , there is no definite pneumonia . There is mild atelectasis at the left lung base . There is a probable small right pleural effusion . No pneumothorax identified . No overt pulmonary edema . Bony structures appear grossly intact .
    OUTPUT:
    
No definite pneumonia . Increased opacity at right lung base could reflect atelectasis or early developing pneumonia in the appropriate clinical setting .