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A 23-year-old male with intermittent visual loss in his left eye for 4 months was originally treated as optic neuritis elsewhere.Upon presentation to our hospital (Beijing Tongren Hospital),his left eye visual acuity was reduced to hand motion at face.The left eye ocular motility was limited in upgaze,downgaze,adduction,and abduction.Computed tomography and magnetic resonance imaging revealed lesions in the sphenoid and ethmoid sinuses,orbital apex and carvernous sinus invading adjacent extraocular muscles.