[Trigeminal autonomic cephalalgias: three forms of unilateral, short-lasting headache with facial autonomic symptoms].

--Trigeminal autonomic cephalalgias (TACs) include cluster headache, paroxysmal hemicranias and short-lasting unilateral neuralgiform headache attacks with conjunctival injection and tearing (SUNCTs). --Because they are rare, it is often difficult to recognise TACs in practice. Hallmarks of TACs include the strictly unilateral pain near the eye or temple, the accompanying autonomic symptoms, and the specific pattern in the timing of the attacks. --The TAC subtypes differ in the duration and frequency of attacks. Differentiating TAC subtypes is important because it affects the treatment approach. --In rare cases, TAC results from an underlying structural disorder. Neuroimaging (cerebral MRI) is advised in all patients with TAC.