Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Heart size is mildly enlarged but unchanged . The mediastinal and hilar contours are similar . Pulmonary vasculature is not engorged . Linear and patchy opacities in the right upper lobe and lung bases likely reflect areas of atelectasis in the setting of low lung volumes . No focal consolidation , pleural effusion or pneumothorax is present .
    OUTPUT:
    
Low lung volumes with atelectasis in the lung bases and right upper lobe , without focal consolidation to suggest pneumonia .