Bоnus item: 5 pt A 57-yeаr-оld with lоng-stаnding hypertension presents with sudden severe “worst heаdache,” photophobia, nausea, and neck stiffness. She is increasingly somnolent. CT is consistent with aneurysmal subarachnoid hemorrhage. Two days later she develops worsening confusion and a new focal neurologic deficit. Which complication best explains the delayed neurologic deterioration after aneurysmal subarachnoid hemorrhage?