A chronic sixth nerve palsy of undetermined origin may be the first and initially the only sign of a petrous apex-cavernous sinus tumor. Four cases are presented.
Sakalas R, Harbison JW, Vines FS, Becker DP. Chronic Sixth Nerve Palsy: An Initial Sign of Basisphenoid Tumors. Arch Ophthalmol. 1975;93(3):186–190. doi:10.1001/archopht.1975.01010020194005
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