Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Lung volumes are low . Heart size is normal . The aorta is tortuous , and the mediastinal and hilar contours are unchanged . Crowding of the bronchovascular structures is present as a result of low lung volumes . A small to moderate size right pleural effusion is demonstrated with associated right basilar opacity , likely compressive atelectasis . Patchy left basilar opacity also may be reflective of atelectasis . No pneumothorax is identified . No displaced fractures are seen .
    OUTPUT:
    
Low lung volumes . Small to moderate size right pleural effusion with bibasilar airspace opacities , possibly atelectasis but infection or aspiration is not completely excluded .