The site of origin of nasal polyposis in the ethmoid subcompartments assessed from clinical observation of ninety‐four nasal cavities

Abstract

Keypoints  Combined transmastoid and middle fossa approach is the most used approach for meningoencephalic herniations associated tympano-mastoid infection.  A retrospective cohort study was conducted to report the efficacy of a one stage transmastoid approach with canal wall-down tympanoplasty for meningoencephalic herniations associated with cholesteatoma.  Exclusive transmastoid approach with downward repair of the base of the skull with a fragment of remodelled mastoid cortex (or mastoid tip in revision mastoidectomies) and seal using bone dust and partial obliteration of the mastoid cavity was used in all cases.  No postoperative complications, no residual or recurrentcholesteatomasandnorecurrentherniations were observed. Postoperative air-bone gap was within 20 dB in 10 (56%) patients, and there were no cases of bone threshold impairment.  Single-stage canal wall-down tympanoplasty can be considered a clinically-effective approach to treat meningoencephalic herniations associated with cholesteatoma.