An abnormal passage or communication, usually between two internal organs or leading from an internal organ to the surface of the body.
- Oroantral fistula: An opening between the oral cavity and the maxillary sinus.
- Orofacial fistula: An opening between the cutaneous surface of the face and the oral cavity.
- Oronasal fistula: An opening between the nasal cavity and the oral cavity.
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