Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Hyperinflation . Tortuous , calcified thoracic aorta . Heart size within normal . Trace right pleural effusion . The previously demonstrated right lung base opacity is slightly less prominent on the current study , likely atelectasis .
    OUTPUT:
    
Hazy right base opacity is less conspicuous than prior study , and likely represents atelectasis rather than developing pneumonia .