Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Cardiac silhouette size is mildly enlarged . The aorta is tortuous . The mediastinal and hilar contours are otherwise unremarkable . Pulmonary vasculature is not engorged . Streaky left lower lobe opacity likely reflects atelectasis . No focal consolidation , pleural effusion or pneumothorax is present . There are no acute osseous abnormalities . Hypertrophic changes are seen within the thoracic spine .
    OUTPUT:
    
Streaky atelectasis in the left lower lobe .