Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The cardiac , mediastinal and hilar contours are normal . Pulmonary vascularity is normal . Linear opacity within the lingula is compatible with subsegmental atelectasis or scarring . Ill - defined focal opacity within the right mid lung field is not well localized on the lateral view , and could reflect an area of atelectasis , but a focus of infection or inflammation can not be excluded . There is no pleural effusion or pneumothorax . No acute osseous abnormality seen .
    OUTPUT:
    
Ill - defined focal opacity within the right mid lung field . This could reflect an area of atelectasis but infection or inflammation can not be excluded .