Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Portable AP view of the chest demonstrates low lung volumes . Left costophrenic angle is obscured , suggestive of small left pleural effusion . Ill - defined opacity at the right lung base is new since prior . Hilar and mediastinal silhouettes are normal . Partially imaged upper abdomen is unremarkable . Bilateral remote rib fractures are present .
    OUTPUT:
    
Ill - defined opacity in the right lung base is new since prior and may represent atelectasis or infection in the appropriate clinical setting .