Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: A portable frontal chest radiograph demonstrates a replaced tracheostomy appears normally positioned , terminating in the upper thoracic trachea . A right PICC now crosses midline , now terminating in the left subclavian vein . The remainder of the exam is unchanged .
    OUTPUT:
    
Right PICC crosses midline , terminating in the left subclavian vein . This is new compared to chest radiograph from 7 hours prior , but on followup chest radiograph 6 hours later is again appropriately positioned .