A 73-year-old woman presented with a 6-month history of a sudden onset of vertigo, hearing loss in her right ear, and decreased visual acuity in her right eye, which was followed 3 days later by right-sided facial weakness. Four days before presentation, she had developed a sudden onset of hearing loss in her left ear and progressive left-sided facial weakness. Her medical history was remarkable for asthma, angina, primary hypothyroidism, and tuberculosis when she was a child. Her medications included aspirin, omeprazole, thyroxine, atorvastatin, isosorbide mononitrate, glyceryl trinitrate spray, dexamethasone, and β2-agonist inhalers. There was no notable family history.