Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Frontal and lateral views of the chest were obtained . Questioned right basilar opacity is less apparent on this study as compared to the prior study . However , there is subtle right basilar opacity on the frontal view , not substantiated on the lateral view , and which may be similar in comparison to ___ , most likely representing atelectasis . No pleural effusion or pneumothorax is seen . The cardiac silhouette is top normal . The aorta is calcified and tortuous .
    OUTPUT:
    
Questioned right basilar opacity on the prior study is not well seen on the current study and was likely artifactual . Subtle right basilar opacity may be due to atelectasis .