Fig. 2

Flowchart of included patients. Inclusion period lasted from May 2012 to April 2014. TN: Classical trigeminal neuralgia, DHC: Danish Headache Center. *Diagnosis changed to: persistent idiopathic facial pain (PIFP) (N = 33), symptomatic trigeminal neuralgia (N = 12), cluster headache (N = 6), headache not elsewhere classified (N = 5), tension type headache (N = 3), migraine (N = 3), medication-overuse headache (N = 2), occipital neuralgia (N = 1), painful trigeminal neuropathy attributed to other disorder (N = 1). **Diagnosis changed from: PIFP (N = 4), tension type headache (N = 2), cluster headache (N = 1), headache not elsewhere classified (N = 1). ***Reasons for missing inclusion: pain free and did not want further controls (N = 7), unknown (N = 4), patient preferred treatment closer to home (N = 3), tumor not related to TN (N = 3), communication barrier ((Alzheimer’s) N = 1), death not related to TN (N = 1). **** Type of surgery: microvascular decompression (MVD) (N = 29), balloon compression (N = 10), both balloon compression and MVD within 12 months (N = 2), glycerol injection (N = 1), failed balloon compression due to bradycardia (N = 1). *****Did not undergo surgery due to: the neurosurgeon decided not to operate (N = 2), surgery was cancelled as the patient was pain free (N = 1)