Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: There is mild enlargement of the cardiac silhouette . Mediastinal and hilar contours are unremarkable . The pulmonary vasculature is normal . Linear opacities in the lung bases are compatible with subsegmental atelectasis . There is no focal consolidation , pleural effusion or pneumothorax is identified . No acute osseous abnormalities seen .
    OUTPUT:
    
Subsegmental atelectasis in the lung bases .