raremaprare-disease reference indexOrphadata 2026-06-23 · HPO 2026-09-01
ORPHA:598603

Facial dysmorphism-hypertrichosis-epilepsy-intellectual disability/developmental delay-gingival overgrowth syndrome

Synonyms: FHEIG syndrome

Type
Malformation syndrome
Group
Disorder
Inheritance
Autosomal dominant
Age of onset
Childhood, Infancy, Neonatal
Status
active

A rare, genetic, multiple congenital anomalies/dysmorphic syndrome characterized by variable intellectual disability and/or developmental delay, epilepsy, generalized hypertrichosis, severe gingival overgrowth and visual impairment in some patients. Common craniofacial features include bitemporal narrowing, bushy and straight eyebrows, long eyelashes, low-set ears, deep/short philtrum, everted upper lip, prominent upper and lower vermilion, wide mouth, micrognathia, and retrognathia.

1

Names in Orphadata languages

12 of 12 languages
LangNameSynonyms
enFacial dysmorphism-hypertrichosis-epilepsy-intellectual disability/developmental delay-gingival overgrowth syndromeFHEIG syndrome
frSyndrome de dysmorphie faciale-hypertrichose-épilepsie-déficience intellectuelle/retard de développement-hypertrophie gingivaleSyndrome FHEIG
deGesichtsdysmorphie-Hypertrichose-Epilepsie-Intelligenzminderung/Entwicklungsverzögerung-Gingivahypertrophie-SyndromFHEIG-Syndrom
esSíndrome de dismorfia facial-hipertricosis-epilepsia-discapacidad intelectual/retraso del desarrollo-hiperplasia gingivalSíndrome de FHEIG
itSindrome da dismorfismi facciali, ipertricosi, epilessia, disabilità intellettiva/ritardo dello sviluppo e ipertrofia delle gengiveSindrome FHEIG
nlSyndroom van faciale dysmorfie - hypertrichose - epilepsie - intellectuele achterstand/ontwikkelingsachterstand - overgroei van gingivaFHEIG-syndroom
ptSíndrome de dismorfia facial-hipertricose-epilepsia-perturbação do desenvolvimento intelectual/atraso do desenvolvimento-sobrecrescimento gengivalSíndrome FHEIG
plZespół przerostu dziąseł, niepełnosprawności intelektualnej/opóźnienia rozwoju, padaczki, hipertrichozy i dysmorfii twarzyZespół FHEIG
csSyndrom zahrnující obličejový dysmorfismus, hypertrichózu, epilepsii, mentální retardaci/opoždění vývoje a přerůstání dásní= en
ukСиндром дисморфізму обличчя-гіпертрихозу-епілепсії-інтелектуальної недостатності/затримки розвитку-надмірного росту ясенСиндром FHEIG
zhFacial dysmorphism-hypertrichosis-epilepsy-intellectual disability/developmental delay-gingival overgrowth syndrome= en
trFacial dysmorphism-hypertrichosis-epilepsy-intellectual disability/developmental delay-gingival overgrowth syndrome= en

Definition in:

2

Cross-references

qualifier = Orphanet mapping relation
SourceCodeQualifierICD relationValidation
OMIM618381Evalidated
ICD-10Q87.8NTBTattributedvalidated
MONDO0032714Evalidated
UMLSC5193066Evalidated

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

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Classification

Preferential parent (Orphanet linearisation):

Parents in the classifications (5):

No children.

4

Genes

1 direct
GeneAssociationStatusHGNCEnsemblOMIMLocusNameSource of validation
KCNK4Disease-causing germline mutation(s) inAssessedHGNC:6279ENSG0000018245060572011q13.1potassium two pore domain channel subfamily K member 430290154[PMID]
5

Prevalence and incidence

2 records
TypeClassValueAreaQualificationValidationSource
Cases/families4 casesWorldwideCase(s)Validated30290154[PMID]_32981868[PMID]
Point prevalence<1 / 1 000 000—WorldwideClass onlyValidated30290154[PMID]_32981868[PMID]_ORPHANET

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

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HPO phenotypes

Orphanet has no HPO annotation for this code in this release.

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Sources for this card