Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: An AP portable upright chest radiograph is lordotic in projection . Radiodense PICC line tubing is seen extending from the left with the tip at the level of the distal superior vena cava . The lungs appear clear . Apparent main pulmonary arterial calcification is caused by superimposition of mediastinal surgical clips .
    OUTPUT:
    
PICC line tip at level of distal superior vena cava .