Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Portable AP upright chest radiograph obtained . The left arm PICC line is again noted with its tip residing in the mid SVC , minimally retracted from its previous location in the low SVC . The lungs remain clear . No pneumothorax or effusion . Cardiomediastinal silhouette is normal .
    OUTPUT:
    
Appropriately positioned left upper extremity PICC line with tip in the mid SVC .