title: Evaluation of mucosal surface reduction after ethmoidal surgery in nasal polyposis.
abstract: OBJECTIVE
  To assess the reduction of mucosal surface after total sphenoethmoidectomy.
  
  
  METHODS
  Prospective study.
  
  
  METHODS
  Twelve normal, consecutive computed tomography scans were used. Computed tomography measurements were made at two different levels: the cribriform plate, and the upper level of the maxillary antrum. The length of the lateral wall of the ethmoid sinus and the perimeter of each ethmoid cell were measured at each level and on each side. The whole perimeter of the ethmoid sinus was evaluated for each CT scan level. For each side and each level, the ratio between the ethmoid sinus perimeter and the lateral ethmoid wall length was calculated.
  
  
  RESULTS
  The mean length of the lateral ethmoid sinus wall was 61.7+/-1.3 mm and 59.9+/-1.6 mm at the upper and lower parts of the ethmoid sinus, respectively. The mean ethmoid sinus perimeter was 263.2+/-11.5 mm and 250.4+/-11.1 mm at the upper and lower parts of the ethmoid sinus, respectively. No significant statistical difference was observed between measurements as a function of side (right or left) or level (upper or lower). The mean ratio between the ethmoid sinus perimeter and the lateral ethmoid wall length was 4.2.
  
  
  CONCLUSIONS
  After total sphenoethmoidectomy, the mucosal surface of the ethmoid sinuses is reduced by a factor of 4.2; about 76 per cent of the mucosa is removed during total sphenoethmoidectomy.
authors.affiliation: Department of Oto-rhino-laryngology--Head Neck Surgery, European Hospital Georges Pompidou, Assistance Publique--Hôpitaux de Paris, Faculty of Medicine, University Paris-Descartes, Paris, France. pierre.bonfils@egp.aphp.fr
authors.forename: P
authors.initials: P
authors.lastname: Bonfils
authors.forename: P
authors.initials: P
authors.lastname: Avan
authors.forename: P
authors.initials: P
authors.lastname: Palimi
authors.forename: D
authors.initials: D
authors.lastname: Malinvaud
mesh_terms: D004724:Endoscopy; D005005:Ethmoid Sinus / Q000473:pathology / Q000601:surgery*; D006801:Humans; D009297:Nasal Mucosa / Q000473:pathology / Q000601:surgery; D009298:Nasal Polyps / Q000473:pathology / Q000601:surgery*; D015588:Observer Variation; D011446:Prospective Studies; D014057:Tomography, X-Ray Computed