Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: PA and lateral chest radiograph demonstrates a stable cardiomediastinal and hilar silhouette . Heart is top - normal in size . No evidence of pulmonary edema . There is no pleural effusion . A left pectorally placed pacer is identified , its leads which project over the right atrium and right ventricle . Patient is status post sternotomy with wires which appear intact . Note is made of eventration of the right hemidiaphragm . No free air is seen beneath hemidiaphragm . No focal opacity convincing for pneumonia is identified . Linear opacities in the lower lung fields right greater than left likely reflect scarring or linear atelectasis , present on prior examinations and unchanged . No acute osseous abnormalities at detected . Degenerative changes about the bilateral acromioclavicular joints is noted .
    OUTPUT:
    
No focal opacity convincing for pneumonia is identified .