Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Lung volumes are low . Heart size is moderately enlarged but unchanged . Mediastinal and hilar contours are within normal limits . Apart from minimal atelectasis in the lung bases , the lungs are clear without focal consolidation . No pleural effusion or pneumothorax is seen . There clips in the right upper quadrant of the abdomen compatible prior cholecystectomy .
    OUTPUT:
    
Mild bibasilar atelectasis . No focal consolidation to suggest pneumonia .