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