Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Cardiac , mediastinal and hilar contours are normal . Pulmonary vasculature is normal . Patchy opacity in the right lower lobe appears minimally changed from the previous study . No new focal consolidation , pleural effusion or pneumothorax is seen . There are no acute osseous abnormalities identified .
    OUTPUT:
    
Persistent right lower lobe patchy opacity , likely atelectasis . No new focal consolidation .