Oronasal Fistulas (ONF)

An oronasal fistula (ONF) occurs when there is communication between the oral cavity and the nasal passages. The most common location for ONF formation is the area of the inside surface of the maxillary (upper) canine teeth. Water and food can enter the respiratory tract through the ONF, resulting in respiratory tract inflammation and infections. Common clinical signs of ONF can include sneezing, nasal discharge, and chronic infections. However, these symptoms often go unnoticed in our pets, and the condition is typically diagnosed during an oral examination while under anesthesia.

ONFs can occur as a result of severe dental disease, as a complication of tooth extractions, or as an uncommon outcome of radiation therapy. Treating an ONF necessitates a surgical procedure to meticulously clean and close the fistulous tract. Despite all efforts to prevent the initial occurrence or recurrence of ONFs, there is still a risk of persistent fistula formation as a surgical complication.