Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Tunneled hemodialysis catheter is seen with distal lumen projecting over the distal SVC and proximal lumen projecting over the mid SVC . The lungs are low in volume but clear . There is no pleural effusion or pneumothorax . Cardiomediastinal contours and heart size are unremarkable .
    OUTPUT:
    
No acute intrathoracic process .