Subarachnoid neurocysticercosis presenting as a sudden severe headache.

A 46-year-old man, an immigrant from Central America, presented to the emergency department after a motor vehicle collision. He had developed a progressive headache over the previous 48 hours, which had suddenly worsened while driving, causing him to crash. There was no significant head trauma. Clinical and radiological findings prompted a workup for atypical subarachnoid haemorrhage.