Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Lung volumes are low . Heart size is mildly enlarged with a left ventricular predominance . The mediastinal and hilar contours are unchanged . Crowding of the bronchovascular structures is present due to low lung volumes without overt pulmonary edema . Minimal patchy opacities in the lung bases likely reflect areas of atelectasis or scarring . No focal consolidation , pleural effusion or pneumothorax is present . No acute osseous abnormalities demonstrated .
    OUTPUT:
    
Mild bibasilar atelectasis .