A Case of Inverted Supernumerary Tooth in the Nasal Cavity

Eruption of a tooth into the nasal cavity is rarely encountered. We report a case of an inverted supernumerary tooth in the nasal cavity. A 16-year-old man was referred to our hospital after examination at a local otorhinolaryngology clinic for right nasal obstruction. CT revealed a tooth-like structure in the right nasal cavity. Endoscopic surgery was performed under general anesthesia. The tooth-like structure, protruding from the floor of the nasal cavity and extending to the maxilla, was endoscopically removed in spite of its being strongly adherent to the floor of the nasal cavity. The diagnosis was an inverted tooth caused by abnormal eruption of a supernumerary tooth into the nasal cavity. Inverted intranasal eruption of a supernumerary tooth is rare: the majority of supernumerary teeth have been reported in the maxilla and impacted. We, otorhinolaryngologists, should bear in mind the possibility of inverted intranasal eruption of a tooth when a calcified structure is noted on the floor of the nasal cavity.