Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Cardiac , mediastinal and hilar contours are normal . Pulmonary vasculature is normal . Minimal patchy opacities are seen in the lung bases , most likely reflective of atelectasis . Linear scarring within the peripheral aspect of the right lung base is also unchanged . No focal consolidation , pleural effusion or pneumothorax is visualized . No acute osseous abnormality is detected .
    OUTPUT:
    
Patchy opacities in the lung bases , likely atelectasis .