Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Cardiac silhouette size is borderline enlarged with a left ventricular predominance . The aorta is tortuous . The mediastinal and hilar contours are otherwise unremarkable . Streaky opacity in the retrocardiac region may reflect atelectasis though infection is not completely excluded . No pleural effusion or pneumothorax is present , and the right lung is clear . Moderate multilevel degenerative changes are demonstrated in the thoracic spine .
    OUTPUT:
    
Streaky retrocardiac opacity , likely atelectasis . Early infection is not completely excluded in the correct clinical setting .