A 62-year-old woman is brought to the emergency department by her husband after a sudden onset of diplopia 30 minutes ago. She has a 3-day history of fever, headache, fatigue, right-sided facial pain, and waxing and waning blurred vision in the right eye. Temperature is 100.8 F. Physical examination shows tenderness and mild swelling of the right side of the face. Laboratory studies show an elevated ESR and a hemoglobin of 10.5 g/dL (NR 13-17.5). Which of the following is the most likely diagnosis?
Amyotrophic lateral sclerosis
Arteritis
Embolus
Optic neuritis
Trigeminal neuralgia
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