Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Round mass centered in the right middle lobe is again seen . Linear opacity at the left lung base is suggestive of atelectasis . The lungs are otherwise clear . Cardiac silhouette is within normal limits . No acute osseous abnormalities identified . Surgical clips in the right upper quadrant suggest prior cholecystectomy .
    OUTPUT:
    
Right middle lobe round mass lesion as seen on prior PET . No superimposed acute cardiopulmonary process .