Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Slightly rotated positioning . The PICC line tip is poorly delineated , but appears to overlie the mid SVC . No pneumothorax is detected . A left - sided single lead pacemaker is in place , with lead tip over the right ventricle . There is stenting of the aorta . The patient is status post sternotomy , with a prosthetic valve . The heart is not enlarged . Mild prominence of the main pulmonary artery may be present , but is unchanged . There is upper zone redistribution , without other evidence of CHF . No focal infiltrate or gross effusion . Minimal bibasilar atelectasis . The extreme left costophrenic angle is excluded from the film .
    OUTPUT:
    
1 . PICC line tip over mid SVC . 2 . Upper zone redistribution and bibasilar atelectasis , without other evidence of acute pulmonary process . 3 . Pacemaker , prosthetic cardiac valve , and aortic stent noted .