Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Lung volumes remain low . Heart size is mildly enlarged . Mediastinal and hilar contours appear unchanged . Crowding of the bronchovascular structures is re - demonstrated without overt pulmonary edema . Patchy opacities are re - demonstrated in the lung bases , not substantially changed in the interval . No large pleural effusion or pneumothorax is detected .
    OUTPUT:
    
Low lung volumes with patchy bibasilar airspace opacities , likely atelectasis though infection or aspiration is not excluded in the correct clinical setting .