A 36-year-old woman comes to the emergency department because of a severe headache. She states that the headache woke her up from sleep 6 hours ago, and was not relieved by aspirin or acetaminophen. She also noticed that she has neck stiffness and that "it hurts" during neck extension and flexion. She was recently diagnosed with Hodgkin's disease, but before that, she was usually "pretty healthy," except for a few urinary tract infections and hypertension. Her temperature is 39.0 C (102.2 F), blood pressure is 130/80 mm Hg, pulse is 75/min, and respirations are 17/min. She appears lethargic. Physical examination shows nuchal rigidity, flank tenderness, and a mid-systolic click. Funduscopic examination shows bilateral optic disc swelling. After blood cultures are obtained the most appropriate next step is to
A. administer ceftriaxone, intravenously
B. order a CT scan of the head
C. order a MR angiogram of the head
D. order an MRI of the head
E. perform a lumbar puncture
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