Avoiding Pitfalls in the Diagnosis of Subarachnoid Hemorrhage

“For it happens in this, as the physicians say it happens in hectic fever, that in the beginning of the malady it is easy to cure but difficult to detect, but in the course of time, not having been either detected or treated in the beginning, it becomes easy to detect but difficult to cure.” — Niccolò Machiavelli, The Prince Patients with headache account for 1 to 2 percent of visits to the emergency department14 and up to 4 percent of visits to physicians' offices.5 Most have primary headache disorders, such as migraine and tension-type headaches. Only a few . . .