Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The heart is mildly enlarged . There is moderate unfolding along the descending thoracic aorta . The cardiac , mediastinal and hilar contours appear unchanged . There is no pleural effusion or pneumothorax . The lungs appear clear . Mild degenerative changes are noted along the lower thoracic spine .
    OUTPUT:
    
No evidence of acute cardiopulmonary disease . Streaky opacities in the lower lobes are most consistent with atelectasis .