A case of supernumerary nostril.

A very rare case of supernumerary nostril is reported. This case is different from previously reported cases, because this accessory nostril was located nearer the nasal septum than the natural nostril and its opening was on the same level as the natural one. Although its cause and development are only speculative due to the small number of reported cases, a new hypothesis is proposed and discussed, since our findings are contradictory to previous literature.