“…Of the 53 "nonstructural" cases, 13 fulfilled ICHD criteria for MWA (Figure 2). 65,66,68,72,77,82,83,86,87,92,98 In these cases, aura was assumed to be caused by cardiac myxoma (n = 1), viral meningitis (n = 1), head trauma (n = 1, severity not reported), idiopathic intracranial hypertension (n = 1), neurosyphilis (n = 1), cerebral venous thrombosis (n = 1), stellate ganglion block (n = 1), cardiac ablation (n = 4), and the presence of prosthetic heart valves (n = 2). Aura was associated with headache in all cases and preceded the headache in nine.…”