PRRT2 - Whereas heterozygous PRRT2 mutations (typically involving similar deletions in the same cytosine stretch) have been identified in a few patients with hemiplegic migraine [63, 64, 66, 67], it must be taken into account that many hundreds of patients with such mutation who suffer from paroxysmal kinesigenic dyskinesia, benign familial infantile seizures, or infantile convulsion choreoathetosis syndrome [66] do not have hemiplegic migraine. This evidence concerns the gene PRRT2 and familial or sporadic hemiplegic migraine.