This unspecific finding occurred at a significant higher frequency in genetically confirmed CACNA1A patients as compared with the control group, consisting of phenocopies with episodic ataxia or hemiplegic migraine but negative genetic testing for CACNA1A. Currently, a number of these controls have been tested positive for GAA-FGF14 disease (seven out of 18 “CACNA1A phenocopies” from [9], 39%). Here, CACNA1A is linked to familial or sporadic hemiplegic migraine.