raremaprare-disease reference indexOrphadata 2026-06-23 · HPO 2026-09-01
ORPHA:1818

Ectodermal dysplasia, trichoodontoonychial type

Type
Malformation syndrome
Group
Disorder
Age of onset
Antenatal, Infancy, Neonatal
Status
active

Ectodermal dysplasia, trichoodontoonychial type is a form of ectodermal dysplasia with hair, teeth and nail involvement characterized predominantly by hypodontia, hypotrichosis, delayed hair growth and brittle nails. Additionally, focal dermal hypoplasia, irregular hyperpigmentation, hypoplastic or absent nipples, amastia, hearing impairment, congenital hip dislocation and asthma have been associated. There have been no further descriptions in the literature since 1996.

1

Names in Orphadata languages

12 of 12 languages
LangNameSynonyms
enEctodermal dysplasia, trichoodontoonychial type
frDysplasie ectodermique tricho-odonto-onychiale
deDysplasie, ektodermale, tricho-odonto-onychaler Typ
esDisplasia ectodérmica tipo trico-odonto-oniquial
itDisplasia ectodermica, tipo onico-trico-dentale
nlEctodermale dysplasie, tricho-odonto-onychiaal type
ptDisplasia ectodérmica, tipo trico-odonto-ungueal
plDysplazja ektodermalna typu włosowo-zębowo- paznokciowego
csEktodermální dysplázie, trichoodontoonychiální typ
ukЕктодермальна дисплазія, трихоодонтооніхіальний тип
zh外胚层发育不良,毛发牙齿型
trEktodermal displazi, trishoodontokonşiyal tip

Definition in:

2

Cross-references

qualifier = Orphanet mapping relation
SourceCodeQualifierICD relationValidation
OMIM129510Evalidated
ICD-10Q82.4NTBTattributedvalidated
ICD-11LD27.0YNTBTindexvalidated
MONDO0007511Evalidated
MeSHC565068Evalidated
UMLSC1851858Evalidated
GARD2055Evalidated

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 (3):

No children.

4

Genes

0 direct

Orphanet records no gene directly on this code.

5

Prevalence and incidence

2 records
TypeClassValueAreaQualificationValidationSource
Cases/families7 casesWorldwideCase(s)Validated3740884[PMID]
Point prevalence<1 / 1 000 000—WorldwideClass onlyValidatedORPHANET_3740884[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

12 annotations · validated 2016-06-01
HPOTerm (as annotated by Orphanet)Diagnostic
Very frequent (99-80%)
HP:0006482Abnormal dental morphology
HP:0008388Abnormal toenail morphology
HP:0000366Abnormality of the nose
HP:0000668Hypodontia
HP:0007521Irregular hyperpigmentation of back
HP:0100578Lipoatrophy
HP:0002231Sparse body hair
HP:0008070Sparse hair
Frequent (79-30%)
HP:0000499Abnormal eyelash morphology
HP:0100840Aplasia/Hypoplasia of the eyebrow
HP:0006709Aplasia/Hypoplasia of the nipples
HP:0000995Melanocytic nevus

Run the differential on the 8 obligate / very frequent terms

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Sources for this card