Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Frontal and lateral views of the chest demonstrate a left pectoral dual - lead pacer / AICD with leads terminating in the right atrium and right ventricle . The heart is normal in size . There is mild thoracic aortic unfolding . Atherosclerotic calcifications are seen in the arch . Suspected right middle lobe mass is present since at least ___ and previously evaluated on CT . Right basilar fibrosis is also better demonstrated on prior CT . Aerated upper lungs are clear . There is no pneumothorax , vascular congestion , or pleural effusion .
    OUTPUT:
    
1 . No acute cardiopulmonary process . 2 . Probable right middle lobe mass , better assessed on prior CT .\ 3 . Right bibasilar pulmonary fibrosis .