Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Cardiac silhouette size is normal . The aorta is mildly tortuous , unchanged . Tortuous right brachiocephalic artery with peripheral calcification is re - demonstrated . Known left hilar mass is not well visualized on the current exam . Pulmonary vasculature is normal . Lungs are clear . No pleural effusion or pneumothorax is present . Patient is status post left shoulder arthroplasty .
    OUTPUT:
    
No acute cardiopulmonary abnormality . Known left hilar mass is better visualized on the previous PET - CT .