A case of a nasal polyp originating in the cribriform plate.

Nasal polyps were once believed to originate in sinus cavities, and from there to pass through ostia and into the nasal cavity. However, data gained from subsequent anatomic studies revealed that they can actually originate in numerous locations in the sinonasal area. We report a case of a nasal polyp that originated in the cribriform plate, which is a very rare site of origin for a nasal polyp.