raremaprare-disease reference indexOrphadata 2026-06-23 · HPO 2026-09-01
ORPHA:2890

Pili torti-onychodysplasia syndrome

historical

Type
Malformation syndrome
Group
Disorder
Inheritance
Autosomal recessive
Age of onset
Infancy, Neonatal
Status
historical

A rare ectodermal dysplasia syndrome characterized by congenital onychodystrophy (particularly of the distal nail) and severe hypotrichosis with alopecia involving the eyebrows, eyelashes and body hair. Scalp, beard, pubic and axillary hair is brittle and shows a twisting pattern on electron microscopy. There have been no further descriptions in the literature since 1991.

1

Names in Orphadata languages

12 of 12 languages
LangNameSynonyms
enPili torti-onychodysplasia syndrome
frSyndrome de pili torti-onychodysplasie
dePili torti-Onychodysplasie-SyndromSyndrom der Pili torti mit Onychodystrophie
esSíndrome de pili torti-onicodisplasia
itSindrome da pili torti e onicodisplasia
nlPili torti - onychodysplasie-syndroom
ptSíndrome de pili torti-onicodisplasia
plWłosy skręcone - dysplazja paznokci
csSyndrom zahrnující pili torti a onychodysplázii
ukСиндром перекрученого волосся-оніходисплазії
zh卷发-甲发育不良综合征
trPili torti-onikodisplazi sendromu

Definition in:

2

Cross-references

qualifier = Orphanet mapping relation
SourceCodeQualifierICD relationValidation
ICD-10Q82.4NTBTattributedvalidated
ICD-11LD27.0YNTBTindexvalidated
MONDO0017321Evalidated
MeSHC537399Evalidated
UMLSC4509919Evalidated
GARD4364Evalidated

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 (1):

No children.

4

Genes

0 direct

Orphanet records no gene directly on this code.

5

Prevalence and incidence

2 records
TypeClassValueAreaQualificationValidationSource
Cases/families1 familiesWorldwideFamily(ies)Validated1879585[PMID]
Point prevalence<1 / 1 000 000—WorldwideClass onlyValidatedORPHANET_1879585[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

20 annotations · validated 2017-11-27
HPOTerm (as annotated by Orphanet)Diagnostic
Obligate (100%)
HP:0000968Ectodermal dysplasia
Frequent (79-30%)
HP:0000377Abnormal pinna morphology
HP:0002223Absent eyebrow
HP:0000561Absent eyelashes
HP:0001596Alopecia
HP:0002289Alopecia universalis
HP:0002299Brittle hair
HP:0410030Cleft lip
HP:0000175Cleft palate
HP:0008394Congenital onychodystrophy
HP:0030953Conjunctival hyperemia
HP:0012725Cutaneous syndactyly
HP:0000958Dry skin
HP:0000964Eczematoid dermatitis
HP:0007439Generalized keratosis follicularis
HP:0010562Keloids
HP:0008404Nail dystrophy
HP:0000982Palmoplantar keratoderma
HP:0002552Trichodysplasia
Occasional (29-5%)
HP:0002231Sparse body hair

Annotation source: 1879585[PMID]_1479096[PMID]

7

Sources for this card