Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: A right PICC ends in the mid superior vena cava . The lungs are clear without focal opacity , pleural effusion or pneumothorax . Mediastinal surgical clips and stents are noted . There are aortic knob calcifications . The heart size is top normal . Prominence of the right hila is stable .
    OUTPUT:
    
Right PICC ends in the superior vena cava . No pneumothorax .