Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The heart is at the upper limits of normal size . The mediastinal and hilar contours appear within normal limits . There is no pleural effusion or pneumothorax . Streaky basilar densities , greater on the left than right , are most consistent with minor atelectasis . There is no evidence for free air .
    OUTPUT:
    
No evidence for acute disease or free air .