Monarch Disease Ontology entry MONDO_0011232 (migraine, familial hemiplegic, 2) is any familial or sporadic hemiplegic migraine in which the cause of the disease is a mutation in the ATP1A2 gene. Also known as: ATP1A2 familial or sporadic hemiplegic migraine, familial or sporadic hemiplegic migraine caused by mutation in ATP1A2, migraine, familial hemiplegic, type 2.