Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The heart size is mildly enlarged . Mediastinal and hilar contours are unchanged . The pulmonary vascularity is normal . Ill - defined streaky opacity in the right lower lobe is new compared to the prior exam , and could reflect an area of atelectasis . There is no pneumothorax or pleural effusion . There are no acute osseous abnormalities .
    OUTPUT:
    
Minimal patchy opacity in the right lower lobe may reflect an area of atelectasis . Infection can not be excluded in the correct clinical context .