Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Vague opacity is identified at the right lung base on the frontal view . It is better seen on 1 of the 2 lateral views than on the other . The lungs are otherwise clear . The cardiomediastinal silhouette is within normal limits . No acute osseous abnormalities identified .
    OUTPUT:
    
Vague right basilar opacity , potentially atelectasis although infection is not excluded .