raremaprare-disease reference indexOrphadata 2026-06-23 · HPO 2026-09-01
ORPHA:236

Trisomy 9p syndrome

Synonyms: Duplication 9p · Duplication of the short arm of chromosome 9 · Trisomy of the short arm of chromosome 9

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

Trisomy 9p is a rare chromosomal anomaly syndrome, resulting from a partial or complete trisomy of the short arm of chromosome 9, with a wide phenotypic variablility, typically characterized by intellectual disability, craniofacial dysmorphism (e.g. microcephaly, large anterior fontanel, hypertelorism, strabismus, downslanting palpebral fissures, malformed, low-set, protruding ears, bulbous nose, macrostomia, down-turned corners of mouth, micrognathia), digital anomalies (brachydactyly and clinodactyly), and short stature. Less frequently patients present with cardiopathy and renal, skeletal, and central nervous system malformations.

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Names in Orphadata languages

12 of 12 languages
LangNameSynonyms
enTrisomy 9p syndromeDuplication 9p · Duplication of the short arm of chromosome 9 · Trisomy of the short arm of chromosome 9
frSyndrome de trisomie 9pDuplication 9p · Trisomie du bras court du chromosome 9
deDuplikation 9p partialTrisomie 9p partielle
esSíndrome de trisomía 9pDupliación 9p · Duplicación del brazo corto del cromosoma 9 · Trisomía del brazo corto del cromosoma 9
itSindrome trisomia 9pDuplicazione 9p · Trisomia del braccio corto del cromosoma 9 · Duplicazione del braccio corto del cromosoma 9
nlTrisomie 9p-syndroomDuplicatie 9p · Korte arm van chromosoom 9 duplicatie · Korte arm van chromosoom 9 trisomie
ptTrissomia 9pDuplicação parcial 9p · Trissomia parcial 9p
plZespół trisomii 9pDuplikacja 9p · Duplikacja krótkiego ramienia chromosomu 10 · Trisomia krótkiego ramienia chromosomu 9
csTrizomie 9pDuplikace 9p · Duplikace krátkého raménka chromozomu 9 · Trizomie krátkého raménka chromozomu 9 · Syndrom Rethoreové
ukТрисомія 9pДуплікація 9p · Дуплікація короткого плеча хромосоми 9 · Трисомія короткого плеча хромосоми 9
zh9号染色体短臂三体9号染色体短臂三体
trTrizomi 9pDuplikasyon 9p · 9. kromozomun kısa kolunun trizomisi · 9. kromozomun kısa kolunun duplikasyonu

Definition in:

2

Cross-references

qualifier = Orphanet mapping relation
SourceCodeQualifierICD relationValidation
ICD-10Q92.2NTBTattributedvalidated
ICD-11LD41.81Especificvalidated
MONDO0016526Evalidated
UMLSC0265428Evalidated

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 (4):

No children.

4

Genes

0 direct

Orphanet records no gene directly on this code.

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Prevalence and incidence

2 records
TypeClassValueAreaQualificationValidationSource
Cases/families150 casesWorldwideCase(s)Validated25526829[PMID]
Point prevalence<1 / 1 000 000—WorldwideClass onlyValidatedORPHANET_25526829[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.

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HPO phenotypes

27 annotations · validated 2016-06-01
HPOTerm (as annotated by Orphanet)Diagnostic
Very frequent (99-80%)
HP:0007477Abnormal dermatoglyphics
HP:0005105Abnormal nasal morphology
HP:0000615Abnormal pupil morphology
HP:0000248Brachycephaly
HP:0000490Deeply set eye
HP:0002714Downturned corners of mouth
HP:0001263Global developmental delay
HP:0001804Hypoplastic fingernail
HP:0001800Hypoplastic toenails
HP:0001249Intellectual disability
HP:0000400Macrotia
HP:0000252Microcephaly
HP:0000411Protruding ear
HP:0000470Short neck
HP:0006610Wide intermamillary distance
Frequent (79-30%)
HP:0007598Bilateral single transverse palmar creases
HP:0001156Brachydactyly
HP:0004209Clinodactyly of the 5th finger
HP:0000678Dental crowding
HP:0000494Downslanted palpebral fissures
HP:0100798Fingernail dysplasia
HP:0000316Hypertelorism
HP:0011079Impacted tooth
HP:0002808Kyphosis
HP:0000960Sacral dimple
HP:0002650Scoliosis
Occasional (29-5%)
HP:0100335Non-midline cleft of the upper lip

Run the differential on the 12 obligate / very frequent terms

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Sources for this card