Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: A right upper extremity PICC has been slightly retracted in the interim , now terminating within the mid SVC . A left pectoral pacemaker is unchanged . There is improved aeration of the left lung base with residual streaky opacities , reflecting atelectasis . There is no pleural effusion , pneumothorax or focal airspace consolidation worrisome for pneumonia . There is no pneumomediastinum or subcutaneous air . The heart is normal size . The mediastinal structures and hilar contours are unremarkable .
    OUTPUT:
    
1 . Satisfactory position of a right upper extremity PICC . 2 . No pneumomediastinum .