Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The heart size is normal . Mediastinal and hilar contours are unremarkable . The pulmonary vasculature is normal . Streaky opacities in the lung bases likely reflect atelectasis . No focal consolidation , pleural effusion or pneumothorax are seen . There are mild degenerative changes in the thoracic spine .
    OUTPUT:
    
No acute cardiopulmonary process .