A nurse in an emergency department is caring for a client who had a seizure and became unresponsive after stating she had the worst headache she has ever experienced along with some vomiting. The client’s vital signs are as follows: blood pressure of 205/110 mm Hg, pulse of 52/min, respirations of 24/min, and a temperature of 38.2°C (100.8°F). Which of the following neurologic disorders should the nurse suspect?