Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: There has been interval retraction of the right PICC line , with the tip now overlying the right subclavian vein . Otherwise , the remainder of the exam is grossly unchanged , with slightly improved lung volumes and redemonstration of left lung base atelectasis and elevation of the left hemidiaphragm .
    OUTPUT:
    
Interval retraction of the right PICC line , with tip now overlying the right subclavian vein . The remainder of the exam is grossly unchanged , with slightly improved lung volumes .