Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Single portable view of the chest is compared to previous exam from ___ . Linear opacity identified at the right lung base projecting over the hemidiaphragm is most suggestive of atelectasis . Elsewhere , the lungs are clear . Cardiac silhouette is enlarged but stable given differences in positioning and technique . Atherosclerotic calcifications are again noted at the aortic arch . Healed lateral left rib fractures are noted .
    OUTPUT:
    
No acute cardiopulmonary process . Stable cardiomegaly .