骨性視神経管狭窄を呈した後篩骨洞粘液嚢胞の1例

Hyperostotic Optic Canal Stenosis Caused by Mucocele of the Posterior Ethmoid Sinus : a case report

I．はじめに

　副鼻腔粘液嚢胞が骨を破壊し，視神経を直接圧迫するために視力，視野障害を生じることは少なくないが^{1,4,5,7,8,10,12,15-17）}，骨過形成のため視神経の圧迫を生じたという報告はない．

　今回，後節骨洞粘液嚢胞に伴う反応性骨肥厚のため，視神経管狭窄を生じて視力，視野障害を来たした稀な1例を経験したので文献的考察を加え報告する．

　We reported a rare case of hyperostotic optic canal stenosis caused by mucocele of the posterior ethmoidsinus. A 49-year-old woman presented with progressive right visual disturbance. She had a visual acuityloss, a ring-shaped visual field defect, and a choked disc in the right eye. An X-ray of Rhese-Goalwin'sview revealed a right optic canal stenosis. A CT scan also disclosed regional hyperostosis in the right lateral wall of the posterior ethmoid sinus. The posterior ethmoid sinus had a small cystic mass which was diagnosed as a mucocele by MR images. The patient's symptoms recovered rapidly after an operation for theextradural optic canal release through right frontotemporal craniotomy. We supposed that spread of an inflammation by mucocele was able to cause regional hyperostosis in thewall of the ethmoidal sinus, which led to optic canal stenosis.