Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The cardiac , mediastinal and hilar contours are normal . Pulmonary vascularity is normal . Patchy opacity in the right lung base likely reflects atelectasis and crowding of bronchovascular structures . No focal consolidation , pleural effusion or pneumothorax is present . There are no acute osseous abnormalities .
    OUTPUT:
    
Patchy opacity in the right lung base likely reflects a combination of crowding of the bronchovascular structures and atelectasis .