SUNCT/SUNA: frequently misdiagnosed as trigeminal neuralgia?

Objective. Identify the number of cases with a possible diagnosis of short-lasting unilateral neuralgiform headache attacks with conjunctival injection and tearing (SUNCT) or short-lasting unilateral neuralgiform headache attacks with cranial autonomic symptoms (SUNA) in patients with a previous diagnosis of Trigeminal Neuralgia (TN) at the Neurology Service of the National Medical Center 20 de Noviembre. This will confirm that these trigeminal-autonomic cephalalgias should be ruled out and considered as differential diagnoses of trigeminal neuralgia. Patients and methods. Cross-sectional and retrospective study. The complete electronic medical records of 100 patients with a diagnosis of TN were evaluated during the period from April 2010 to May 2020. Autonomic symptoms were intentionally searched for in these patients and compared with the diagnostic criteria of SUNCT and SUNA of the 3(rd) edition of the International Classification of Headache Disorders. Chi-square tests and subsequent bivariate regression were performed to determine the association between variables. Results. One hundred patients with a diagnosis of TN were included. After reviewing the clinical manifestations, 12 patients with autonomic symptoms were found and compared with the diagnostic criteria of SUNCT and SUNA. However, they did not meet the absolute criteria to be diagnosed with the previously mentioned diseases, nor to be ruled out. Conclusions. TN is a painful and frequent entity that can present with autonomic symptoms, therefore making it important to identify SUNCT and SUNA as differential diagnoses, to recognize them and treat them appropriately.