Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Cardiac silhouette size remains mildly enlarged but unchanged . The aorta is tortuous . Mediastinal and hilar contours are otherwise unchanged . Pulmonary vasculature is normal . No focal consolidation , pleural effusion or pneumothorax is present . Streaky left basilar opacity likely reflects atelectasis . No acute osseous abnormality is identified .
    OUTPUT:
    
Minimal left basilar atelectasis .