What is the blood-testis barrier, and why is it important? A 56-year old male with a history of polycystic kidney disease presented to the emergency room because of sudden onset severe headache. He has never had this type of headache in the past. Examination shows some nuchal rigidity. Neurologic examination is within normal limits. Which of the following is most likely the diagnosis? a. Migraine headaches b. Bacterial meningitis c. Temporal arteritis d. Subarachnoid hemorrhage e. Intracerebral hemorrhage

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