MA is a 75-year-old woman who noted the sudden onset of a severe headache with concurrent loss of vision in her right eye. Her left eye was legally blind at the 20/200 level from preexisting macular degeneration, but she had been able to read and watch TV with her 20/40 right eye. She presented at her local emergency room, where a CT scan was performed because of the headache. It was read as normal by the radiologist.
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