“PO-46 | Diagnostic tests and headache misdiagnoses in individuals with resistant and refractory migraine – data from the REFINE study: Federico De Santis,1 Chiara Rosignoli,1 Agnese Onofri,1 Mark Braschinsky,2 Olga Sved,2 Raquel Gil-Gouveia,3,4 Renato Oliveira,3 Christian Lampl,5 Jakob Paungarttner,5 Paolo Martelletti,6 William David Wells-Gatnik,7 Isabel Pavao Martins,8 Dimos D Mitsikostas,9 Loukia Apostolakopoulou,9 Aynur Ozge,10 Dilan Bayar Narin,10 Patricia Pozo-Rosich,11 Albert Munoz-Vendrell,11 Maria Pia Prudenzano,12 Martino Gentile,12 Kristina Ryliskiene,13 Jurgita Vainauskiene,14 Margarita Sanchez-del-Rio,15 Fabrizio Vernieri,16 Gianmarco Iaccarino,16 Marta Waliszewska-Prosół,17 Sławomir Budrewicz,17 Marta Carnovali,18 Zaza Katsarava,18 Simona Sacco,1 Raffaele Ornello1 | 1Department of Biotechnological and Applied Clinical Sciences, University of L’Aquila, L’Aquila, Italy; 2Department of Neurology and Neurosurgery, Institute of Clinical Medicine, Faculty of Medicine, University of Tartu and Neurology Clinic of Tartu University Hospital, Tartu, Estonia; 3Headache Center, Neurology Department, Hospital da Luz, Lisboa, Portugal; 4Center for Interdisciplinary Research in Health, Universidade Católica Portuguesa, Lisboa; 5Headache Medical Center, Seilerstaette Linz, Linz, Austria; 6Unitelma Sapienza University of Rome, Italy; 7Texas Tech University Health Sciences Center, El Paso TX, USA; 8Centro de Estudos Egas Moniz, Faculty of Medicine, University of Lisbon, Lisbon, Portugal; 9First Department of Neurology, Aeginition Hospital, National and Kapodistrian University of Athens, Athens, Greece; 10Department of Neurology, Mersin University Medical Faculty, Mersin, Turkey and NOROM Neuroscience and Neurotechnology Center of Excellence, Ankara, Turkey; 11Headache Unit, Neurology Department, Vall d’Hebron University Hospital, Headache and Neurological Pain Research Group, VHIR, Barcelona, Spain; 12Headache Center, ‘I. Amaducci’ Neurological Clinic, Policlinico General Hospital, Bari, Italy; 13Center of Neurology, Vilnius University, Vilnius, Lithuania; 14Center of Neurology, Kardiolitos klinikos, Vilnius, Lithuania; 15Department of Neurology, Clínica Universidad de Navarra, Madrid, Spain; 16Unit of Headache and Neurosonology, Fondazione Policlinico Campus Bio-Medico and Neurology, Università Campus Bio-Medico di Roma, Roma, Italy; 17Department of Neurology, Wroclaw Medical University, Wrocław, Poland; 18Department of Neurology, Christian Hospital Unna and University of Duisburg-Essen, Ruhr Metropolitan, Germany” (2025) Confinia Cephalalgica, 35(S1). doi:10.4081/cc.2025.15868.