Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The cardiomediastinal and hilar contours are within normal limits demonstrating mild cardiomegaly . The aorta is tortuous and shows moderate calcified atherosclerosis . There is a subtle opacity involving the inferior portion of the right upper lobe seen on both the frontal on lateral views concerning for infection . There is no pleural effusion or pneumothorax .
    OUTPUT:
    
Subtle opacity at the base of the right upper lobe could reflect pneumonia .