Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: AP semi-upright portable chest radiograph obtained . A right upper extremity PICC line is seen with its tip intervally retracted and now positioned in the right subclavian vein region . The lung volumes are low , though no obvious signs of pneumonia or CHF . No large effusion or pneumothorax . Cardiomediastinal silhouette appears stable . Since the prior exam , lung aeration has improved .
    OUTPUT:
    
Retraction of the right PICC with tip in the region of the right subclavian vein .