Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: A PICC line is difficult to visualize , but courses across the left apex and visible within the superior vena cava , although it is difficult to see the tip since the catheter is not very radiodense . The lungs appear clear . The cardiac , mediastinal and hilar contours are stable . There are no pleural effusions or pneumothorax . Mild degenerative changes are noted along the thoracic spine .
    OUTPUT:
    
No evidence of acute disease . PICC line in place , although the tip is not well visualized noting that the catheter is fairly radiolucent .