Oro-antral fistula

Oro-antral fistula (OAF) is a pathological communication between the oral cavity and the maxillary sinus (antrum).

The term oro-antral fistula is similar to but not synonymous with the term oro-antral communication (OAC). An oro-antral fistula refers to an "epithelialised" pathological unnatural communication between oral cavity and maxillary sinus. It develops when the oro-antral communication fails to close spontaneously, remains patent, and gets then becomes epithelialised 6.

There is a slightly greater male predilection 2.

Oro-antral fistulas may be subtyped by location into:

They can result from a number of reasons:

  • following posterior maxillary tooth extraction
  • trauma
  • following radiation therapy
  • osteomyelitis

Typically seen as a disruption or defect involving the bony floor of the maxillary sinus with soft-tissue opacification or fluid involving the ipsilateral sinus. 

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Article information

rID: 25277
System: Head & Neck
Tag: stub
Synonyms or Alternate Spellings:
  • Oro-antral fistula (OAF)
  • Oro-antral fistulas
  • Oro-antral fistulation
  • Oroantral fistulation
  • Oroantral fistula
  • Oral-maxillary sinus fistula
  • Oral-maxillary sinus fistulas
  • Oral-maxillary sinus fistulation

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