title: Results of transmedial-canthal ethmoidal decompression for severe dysthyroid optic neuropathy.
abstract: OBJECTIVE
  To study the effects of ethmoidal wall (one-wall) decompression using a transmedial-canthal approach (transmedial-canthal ethmoidectomy) for the treatment of dysthyroid optic neuropathy.
  
  
  METHODS
  The ethmoidal wall and air cells were completely removed using a transmedial-canthal approach in 6 eyes of 4 patients (mean age = 55 years; age range, 46-69 years) with dysthyroid optic neuropathy. Similar surgery was performed on 2 contralateral eyes in 2 of the patients for cosmetic reasons. The preoperative corrected visual acuity in the 6 eyes ranged from hand motion to 20/100. Centrocecal scotomas were detected using automatic static threshold perimetry in the 6 eyes.
  
  
  RESULTS
  After transmedial-canthal ethmoidectomy, the corrected visual acuity improved to better than 20/20 in the 6 eyes, and the centrocecal scotomas had almost completely resolved. There were no major complications, such as cerebrospinal fluid leakage or diplopia associated with the surgery. There were no relapses during an average follow-up period of 29 months.
  
  
  CONCLUSIONS
  These findings suggest that transmedial-canthal ethmoidectomy is an effective and safe therapy for dysthyroid optic neuropathy.
authors.affiliation: Department of Ophthalmology, Sapporo Medical University School of Medicine, Hokkaido, Japan.
authors.forename: K
authors.initials: K
authors.lastname: Ohtsuka
authors.forename: Y
authors.initials: Y
authors.lastname: Nakamura
mesh_terms: D000368:Aged; D019299:Decompression, Surgical; D005005:Ethmoid Sinus / Q000601:surgery*; D005260:Female; D006111:Graves Disease / Q000150:complications*; D006801:Humans; D008875:Middle Aged; D009901:Optic Nerve Diseases / Q000000981:diagnostic imaging / Q000209:etiology / Q000601:surgery*; D012189:Retrospective Studies; D012720:Severity of Illness Index; D014057:Tomography, X-Ray Computed; D014792:Visual Acuity