Treatment of thoracic outlet syndrome to relieve chronic migraine.

Prior case reports have suggested that treating thoracic outlet syndrome (TOS) may relieve intractable migraine headaches, but there has been no case series large enough to show when underlying TOS should be suspected as a contributor to migraine burden. This observational followed by questionnaire study was performed in an outpatient neurology practice to identify clinical features of patients with migraine in which TOS contributed to migraine burden. We report the clinical features of 50 consecutive patients (48 women, 2 men, age = 43.9+/12.7 years) who were treated for chronic migraine and TOS (20 migraine with aura, 28 migraine without aura, two hemiplegic migraines). Headaches had become chronic within 1 year of onset in 21 patients (42%) with characteristics as follows (percentages are based on known data): greater severity ipsilateral to TOS limb pain (38/50=76%), presence of limb swelling (32/48=67%), and worsened by recumbency (32/38=84%). Thirty-two patients eventually needed surgery, which included percutaneous transluminal venoplasty, 1st rib removal, scalenectomy, pectoralis minor tenotomy, and/or vein patching. The mean improvement of headaches on the treated side was 72 ± 26.7%; 12 patients experienced complete resolution of headaches after treatment of TOS (follow-up 7.2 ± 5.2 months). Questionnaire responders reported significant reductions in headache days (18.3 ± 8.6 to 11.1 ± 10.8 days/month, p < 0.0016), severity (7.8+/2.5 to 5.4 ± 2.9, p < 0.00079), and need for emergency care (3.6 ± 4.0 to 0.71 ± 1.3 visits/year, p < 0.0029). Chronic migraines can be important manifestations of TOS. Early transition to a chronic state, lateralized limb pain, and headaches worsened by recumbency are clues to the contribution of TOS pathology. Addressing the TOS contribution to migraine can significantly reduce migraine headache burden.