Gray zones in the trigeminal autonomic cephalalgias
Background: Limited data are available about the importance of migrainous features of the trigeminal autonomic cephalalgias (TACs).Methods: We enrolled 99 patients with TACs including 71 cluster headaches, 11 with short-lasting unilateral neuralgiform headache attacks with conjunctival injection and tearing, 10 with paroxysmal hemicrania, and seven