Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The cardiac , mediastinal and hilar contours appear stable . There is no pleural effusion or pneumothorax . The lungs appear clear . A fracture of the proximal left humerus is not imaged in detail on this examination , but is better characterized on a separate series from the same day . Mild degenerative changes affect the lower thoracic spine .
    OUTPUT:
    
No evidence of acute cardiopulmonary disease .