Abstract
A 46-year-old woman observed transient unilateral mydriasis during a classic migraine attack. One week later she experienced a similar episode after which anisocoria was persistent. Subsequent examination showed the clinical and pharmacologic features of a postganglionic parasympathetic paresis (Adie's tonic pupil). This case confirms the hypothesis that transient mydriasis accompanying migraine is due to interruption of parasympathetic innervation rather than sympathetic overactivity.
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