Most of the nasal polyps arise from the lateral walls of the nasal cavity. Nasal polyps originating from the nasal septum with choanal extension are extremely rare. We report a case of large choanal polyp that arised from the posterosuperior aspect of the nasal septum, and extended down to the oropharynx. A 52-year-old woman presented with a two-year history of progressive nasal obstruction and snoring. Findings of anterior rhinoscopy were in normal limits. We think that the term "septochoanal polyp" which, as far as we know, has not been mentioned in the literature before, can be used for this rare lesion.
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