Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Lung volumes are low . This accentuates the size of the cardiac silhouette which is borderline enlarged . The mediastinal and hilar contours are normal . Pulmonary vasculature is normal . Streaky opacities in the lung bases likely reflect atelectasis in the setting of low lung volumes . No large pleural effusion or pneumothorax is present . There are no acute osseous abnormalities .
    OUTPUT:
    
Low lung volumes limit assessment of the lung bases . Streaky opacities within the lung bases most likely reflect atelectasis but infection can not be completely excluded .