Episodes of acute confusion or psychosis in familial hemiplegic migraine

Abstract
Nine members, from four generations, of a single family presented with various manifestations of hemiplegic migraine. All but one have suffered episodes of acute confusion and/or psychosis. Often neither headache nor neurological signs were present at the time these mental changes occurred and in several cases the correct diagnosis was only made when the familial nature of the problem came to be recognised.

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