This patient was a 48-year-old woman who presented with a sudden transient loss of consciousness. When she regained consciousness, she had a severe headache. Fortunately, she was neurologically intact.
Her CT scan showed that she had an extensive subarachnoid hemorrhage (SAH). A SAH is bleeding inside the head into the subarachnoid space where cerebrospinal fluid circulates. This type of SAH is usually related to a cerebral aneurysm.