Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Cardiac silhouette size is normal . The aorta is mildly tortuous . Mediastinal contour is similar . Calcified left hilar nodes suggest prior granulomatous disease . Prominence of the left hilum is similar compared to the previous study there is adjacent left perihilar linear atelectasis . Ill - defined streaky opacities in the left perihilar region and right lung base may reflect areas of infection or atelectasis . Small right pleural effusion is demonstrated . There is no pneumothorax . Moderate multilevel degenerative changes are seen in the thoracic spine .
    OUTPUT:
    
Streaky and patchy opacities in the left perihilar region and right lung base may reflect an infectious process in the correct clinical setting versus atelectasis . Small right pleural effusion .