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Orbital complications of sinus disease continue to appear in clinical practice. Acute visual loss may occur in association with sinusitis either as a complication of orbital cellulitis or, less frequently, as a part of the orbital apex syndrome. The clasification asociated with an affection of the vesels and nerves passing through the superior orbital fisure and the optic foramen and characterized by visual loss and ophthalmoplegia. But it has minimal or no signs of orbital inflammation such as proptosis, chemosis, or lid edema. We experienced a case of temporary monocular visual loss and ophthalmoplegia caused by mucocele in the sphenoid sinus. Thus, we report, with a review of literature, a case of orbital apex syndrome caused by mucocele in the sphenoid sinus in a 53 year-old male patient. (Korean J Otolaryngol 2003 ;46 :780-2)