Right facial pain.
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Non contrast CT head demonstrates air within the right Stensen's duct and the acini of the parotid gland. Both parotid glands appears symmetric and there is no periglandular stranding/inflammation.
The normal path of the Stensen's duct is exquisitely outline by air as it courses over the masseter muscle before piercing the buccinator muscle.
Pneumoparotid maybe due to raised intra-oral pressure resulting incompetence of the valvular mechanism created by the angulated distal intramuscular segment of the Stensen's duct and the buccinator muscle. This maybe occupational related from playing wind instruments, SCUBA diving or iatrogenic. Recognising this entity is important as the patient maybe prone to superimposed parotitis/infection due to the lost of normal valvular mechanism.