Left ocular pain; Nausea; Visual lossA 55-year old female with left ocular pain, nausea and loss of vision. Previous history significant for left optic neuropathy.VA: 20/50 OS; CF at 3' OS; RAPD OSCT; MRICystic mass posterior to left optic nerveSurgery1. Goodwin, J.A., & Glaser, J.S.: Chiasmal syndrome in sphenoid sinus mucocele. Ann. Neurol. 4: 440-444, 1978. 2. Maniscalco, J.E., & Habal, H.B.: Microanatomy of the optic canal. J. Neurosurg.' 48: 402-406, 1978. 3. Waldman, A.L., Merrell, R., Daroff, R.B,, and Geltzer, A.: Mucocele of the sphenoid sinus: A benign imitator. Brit. J. of Ophthalmol. 51: 674-678, 1967. 4. Rothstein, J., Maisel, R.H., Berlinger, N.T., & Wirtschafter, J.D.: Relationship of optic neuritis to disease of the paranasa...