The recognition of perimesencephalic SAH as a subgroup with a benign clinical course has provided clinicians with valuable information that directly influences patient care and education.

Her neurological examination was nonfocal with a GCS score of 15. A CT scan demonstrated a perimesencephalic SAH (Fig 1, Fig 2). A conventional four-vessel cerebral angiogram was negative for ...

A 23-year-old woman presents to the emergency department (ED) with a sudden onset of a thunderclap headache that she describes as the “worst headache of her life.” ...