Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Cardiac silhouette size is normal . The mediastinal and hilar contours are unremarkable . Pulmonary vasculature is normal . Linear opacities within the right upper and middle lobes are compatible with areas of subsegmental atelectasis . Streaky opacity in the left lung base likely reflects an additional site of atelectasis . No focal consolidation , pleural effusion or pneumothorax is demonstrated . Mild degenerative changes are noted in the thoracic spine .
    OUTPUT:
    
Atelectasis within the lung bases and right upper lobe , but no focal consolidation .