Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Heart size is mildly enlarged . The mediastinal and hilar contours are normal . Pulmonary vascularity is is normal . 4 mm nodular density in the right mid lung field likely reflects a calcified granuloma . Streaky retrocardiac opacity could reflect atelectasis , but infection is not completely excluded . Linear opacities in the right lung base likely reflect subsegmental atelectasis . No pleural effusion or pneumothorax is present . There are no acute osseous abnormalities .
    OUTPUT:
    
Streaky retrocardiac opacity could reflect atelectasis but infection can not be excluded .