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On exam, assess for facial instability and airway patency. CT scan is the imaging of choice. The higher the number, the more complex the fracture, the more unstable and the more difficult the airway managment will be. Look for open lacerations or blood in the sinuses and treat with antibiotics if these are found. Consult ENT or plastics urgently for further management.
The reference is a nice review of these fractures
References
https://medicine.uiowa.edu/iowaprotocols/facial-fracture-management-handbook-lefort-fractures