Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The cardiac , mediastinal and hilar contours are stable . Streaky opacities in the lower lungs suggest unchanged atelectasis or scarring . There is no pleural effusion or pneumothorax . Mild degenerative changes are similar along the thoracic spine .
    OUTPUT:
    
No evidence of acute cardiopulmonary disease .