Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The heart size is normal . Abnormal contour of the pneumomediastinum at the level of the azygos vein and enlargement of the right hilus is consistent with patient 's known malignancy seen on the reference chest CT . Nodule in the mid right lung corresponds to the nodule seen on the CT . There is mild bibasilar atelectasis as well as interstitial fibrosis at the lung bases bilaterally . There may be a tiny right pleural effusion . There is no evidence of pneumothorax . The visualized osseous structures are unremarkable .
    OUTPUT:
    
Slight interval increase of opacification at the right lung base which may be secondary to atelectasis ; however , an acute infectious process can not be excluded .