Image of the Month

A 42-year-old woman presented at the ED complaining primarily of headache. Her headaches began as moderate pain 3 weeks before her ED visit; they were at times bitemporal and involved light-headedness, tinnitus, blurred vision, dizziness, epigastric discomfort, and photophobia. Then, 2 weeks before she presented to the ED, the headache pain became incapacitatingly excruciating. She vomited profusely and reported vertigo, paresthesia, and difficulty walking. To learn how imaging changed the course of treatment, see Image of the Month, page 15.