Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Heart size is normal . There is calcification of the aorta , indicating atherosclerosis . The mediastinal and hilar contours are normal . The pulmonary vasculature is normal . Subtle medial right base opacity could represent atelectasis with pneumonia not excluded . No pleural effusion or pneumothorax is seen . There are no acute osseous abnormalities .
    OUTPUT:
    
Subtle medial right base opacity could represent atelectasis with pneumonia not excluded .