Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Left PICC terminates within the mid to lower superior vena cava . Heart size , mediastinal and hilar contours are within normal limits , with persistent mild tortuosity of the thoracic aorta . Lungs are clear , and there are no pleural effusions .
    OUTPUT:
    
Left PICC terminates in the mid to lower superior vena cava .