raremaprare-disease reference indexOrphadata 2026-06-23 · HPO 2026-09-01
ORPHA:569

Familial or sporadic hemiplegic migraine

Type
Disease
Group
Disorder
Inheritance
Autosomal dominant
Age of onset
Childhood
Status
active

A rare variety of migraine with aura characterized by the presence of a motor weakness during the aura. There are two main forms depending on the familial history: patients with at least one first- or second-degree relative who has aura including motor weakness have familial hemiplegic migraine (FHM); patients without such familial history have sporadic hemiplegic migraine (SHM).

1

Names in Orphadata languages

12 of 12 languages
LangNameSynonyms
enFamilial or sporadic hemiplegic migraine
frMigraine hémiplégique familiale ou sporadique
deMigräne, hemiplegische, familiäre oder sporadische Form
esMigraña hemipléjica familiar o esporádica
itEmicrania emiplegica familiare o sporadica
nlFamiliale of sporadische hemiplegische migraine
ptEnxaqueca hemiplégica familiar ou esporádica
plRodzinna lub sporadyczna migrena połowiczo-porażenna
csFamiliární nebo sporadická hemiplegická migréna
ukСімейна або спорадична геміплегічна мігрень
zh家族性或散发性偏瘫型偏头痛
trAilesel veya sporadik hemiplejik migren

Definition in:

2

Cross-references

qualifier = Orphanet mapping relation
SourceCodeQualifierICD relationValidation
OMIM141500BTNTvalidated
OMIM602481BTNTvalidated
OMIM607516NTBTvalidated
OMIM609634BTNTvalidated
ICD-10G43.1NTBTinclusionvalidated
ICD-118A80.10Especificvalidated
MONDO0018925Evalidated
UMLSC0270862Evalidated
GARD10768Evalidated

E exact · NTBT this ORPHAcode is narrower than the target · BTNT broader than the target · ND not decided.

3

Classification

Preferential parent (Orphanet linearisation):

Parents in the classifications (6):

No children.

4

Genes

4 direct
GeneAssociationStatusHGNCEnsemblOMIMLocusNameSource of validation
ATP1A2Disease-causing germline mutation(s) inAssessedHGNC:800ENSG000000186251823401q23.2ATPase Na+/K+ transporting subunit alpha 220301562[PMID]
CACNA1ADisease-causing germline mutation(s) inAssessedHGNC:1388ENSG0000014183760101119p13.13calcium voltage-gated channel subunit alpha1 A20301562[PMID]
PRRT2Disease-causing germline mutation(s) inAssessedHGNC:30500ENSG0000016737161438616p11.2proline rich transmembrane protein 223077016[PMID]_23077024[PMID]_22845787[PMID]
SCN1ADisease-causing germline mutation(s) inAssessedHGNC:10585ENSG000001442851823892q24.3sodium voltage-gated channel alpha subunit 120301562[PMID]
5

Prevalence and incidence

2 records
TypeClassValueAreaQualificationValidationSource
Point prevalence1-5 / 10 00010 / 100 000EuropeValue and classValidated[EXPERT]
Point prevalence1-5 / 10 00010 / 100 000DenmarkValue and classValidated12023326[PMID]

Value is Orphadata's ValMoy: the mean estimate per 100 000 for prevalence and incidence, the number of cases or families for case reports.

6

HPO phenotypes

51 annotations · validated 2020-05-26
HPOTerm (as annotated by Orphanet)Diagnostic
Very frequent (99-80%)
HP:0002167Abnormality of speech or vocalization
HP:0002353EEG abnormality
HP:0011153Focal motor seizure
HP:0011157Focal sensory seizure
HP:0002077Migraine with aura
HP:0001324Muscle weakness
Frequent (79-30%)
HP:0200149CSF lymphocytic pleiocytosis
HP:0012229CSF pleocytosis
HP:0002181Cerebral edema
HP:0011172Complex febrile seizure
HP:0001289Confusion
HP:0000651Diplopia
HP:0010835Dissociated sensory loss
HP:0001260Dysarthria
HP:0011468Facial tics
HP:0032900Focal manual automatism seizure
HP:0032901Focal pedal automatism seizure
HP:0000365Hearing impairment
HP:0001269Hemiparesis
HP:0002922Increased CSF protein concentration
HP:0004305Involuntary movements
HP:0012508Metamorphopsia
HP:0003401Paresthesia
HP:0030786Photopsia
HP:0002172Postural instability
HP:0007240Progressive gait ataxia
HP:0000575Scotoma
HP:0001308Tongue fasciculations
HP:0002321Vertigo
Occasional (29-5%)
HP:0032506Alien limb phenomenon
HP:0002381Aphasia
HP:0001272Cerebellar atrophy
HP:0001259Coma
HP:0032044Decreased vigilance
HP:0008959Distal upper limb muscle weakness
HP:0011199EEG with generalized sharp slow waves
HP:0007209Facial paralysis
HP:0007979Gaze-evoked horizontal nystagmus
HP:0002301Hemiplegia
HP:0010829Impaired temperature sensition
HP:0002463Language impairment
HP:0031179Nuchal rigidity
HP:0012044Seesaw nystagmus
HP:0010833Spontaneous pain sensation
HP:0000360Tinnitus
HP:0010544Vertical nystagmus
Very rare (<4-1%)
HP:0100576Amaurosis fugax
HP:0011196EEG with focal sharp waves
HP:0003392First dorsal interossei muscle weakness
HP:0001249Intellectual disability
HP:0002133Status epilepticus

Run the differential on the 6 obligate / very frequent terms

Annotation source: 29334453[PMID]_29343472[PMID]_21458376[PMID]

7

Sources for this card