A 67-year-old man has a 3-week history of new binocular diplopia. The diplopia became worse over the past week, but then stabilized. Currently his left eye droop has improved. In the first 2 weeks, he had also noticed severe retro-orbital pain on the left side but this pain has since become minimal. He has a history of cataract extraction in the left eye and stable vision. His past medical history is significant for hypertension and diabetes. He cannot remember the names of his medication or his most recent blood sugar level. He also smokes a pack of cigarettes a day. He denies any facial numbness, recent headache, jaw claudication, or other neurologic deficits.
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