Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Left subclavian PICC line , with tip overlying the upper right atrium , near SVC / RA junction . Please see wet reading below . The heart is not enlarged . Aorta slightly unfolded . Mild prominence of the superior mediastinum is likely accentuated by supine AP technique . There is slight upper zone redistribution , also likely accentuated by technique . No CHF , focal infiltrate or effusion is detected . No supine film evidence of pneumothorax is detected . Metal overlying the right shoulder appears to represent some form of shoulder arthroplasty . There is increased lucency about the proximal humeral component , not fully evaluated on this exam . Findings in left shoulder suggest glenohumeral arthritis , chronic rotator cuff tear , and soft tissue anchor which could reflect prior rotator cuff repair .
    OUTPUT:
    
1 . PICC line overlying upper right atrium . Please see wet reading regarding positioning . 2 . No supine film evidence of pneumothorax identified . 3 . No acute pulmonary process detected . 4 . Apparently status post right shoulder arthroplasty . Question increased lucency about the humeral component . Clinical correlation requested .