Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Cardiac silhouette size is normal . Mediastinal and hilar contours are unchanged . Lung volumes are low with crowding of the bronchovascular structures . No overt pulmonary edema is present . Streaky opacities within the lung bases likely reflect atelectasis . No focal consolidation , pleural effusion or pneumothorax . No acute osseous abnormalities . Clips in the upper abdomen are compatible with prior cholecystectomy .
    OUTPUT:
    
No acute cardiopulmonary abnormality .