Some cerebrovascular complications of exercise.

A 43 year old man developed a sudden, severe headache while running in an orienteering competition. He continued to compete for a further 90 minutes before the worsening headache and the onset of vomiting forced him to seek medical help. He had moderate neck stiffness and no neurological deficit when admitted to hospital. Lumbar puncture showed uniformly bloodstained CSF, but CT scan and cerebral angiography were normal. Recovery was uneventful.