• Gilles Zah-Bi, Juliette Abeillon-du Payrat, Anne Laure Vie, Claire Bournaud-Salinas, Emmanuel Jouanneau, and Moncef Berhouma.
• Department of Neurosurgery, Pierre Wertheimer Neurological and Neurosurgical Hospital, Hospices Civils de Lyon, Lyon, France.
• Neurosurgery. 2019 Dec 1; 85 (6): E1059-E1067.

BackgroundDysthyroid optic neuropathy (DON) is a devastating complication of thyroid eye disease. Corticosteroids are the primary medical treatment for DON, but some refractory patients may require surgical management.ObjectiveTo evaluate the efficacy of endoscopic endonasal decompression of the orbital apex in refractory DON.MethodsThis study included patients with refractory DON who underwent endoscopic endonasal decompression of the orbital apex from February 2015 to October 2016. A total of 23 orbital apices were decompressed across 17 patients. Visual acuity, ophthalmometry, tonometry, and visual field were evaluated at the preoperative, early and delayed postoperative stages. Statistical analyses were performed using RStudio software. A Wilcoxon test for matched data was performed to determine if there was a statistically significant difference between pre- and postsurgical treatment for the following items: visual acuity, proptosis, visual field, and intraocular pressure.ResultsVisual acuity improved in 69.5% of the cases with a mean gain of 2.5 points ± 1.6 (P < .05). Additionally, there was an 18.3% reduction in mean proptosis across all cases (P < .05) and a 13.7% decrease in intraocular pressure (P < .05) for all patients. Finally, visual field improved in 82.6% (P < .05) of the cases. The mean time for follow-up was of 6.28 ± 3.7 mo. There were 3 cases of transient postoperative rhinitis and 2 cases of transient diplopia. Two patients experienced recurrence at 4 and 8 mo, respectively.ConclusionEndoscopic endonasal decompression of the orbital apex significantly improves visual parameters. As a result, multidisciplinary screening for patients is crucial to ensure prompt surgical decompression.Copyright © 2019 by the Congress of Neurological Surgeons.

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