raremaprare-disease reference indexOrphadata 2026-06-23 · HPO 2026-09-01
ORPHA:1698

Mosaic trisomy 12 syndrome

Synonyms: Mosaic trisomy chromosome 12 · Trisomy 12 mosaicism

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

Mosaic trisomy 12 is a rare chromosomal anomaly syndrome, with a highly variable phenotype, principally characterized by developmental or growth delay, short stature, craniofacial dysmorphism (e.g. turricephaly, tall forehead, downslanting palpebral fissures, posteriorly rotated and low set ears, narrow palate), congenital heart defects (e.g. atrial septal defect, patent ductus arteriosus), hypotonia, and pigmentary dysplasia. Scoliosis, hearing loss, facial/body asymmetry, and intellectual disability have also been reported.

1

Names in Orphadata languages

12 of 12 languages
LangNameSynonyms
enMosaic trisomy 12 syndromeMosaic trisomy chromosome 12 · Trisomy 12 mosaicism
frSyndrome de trisomie 12 en mosaïque
deMosaik-Trisomie 12Mosaik-Trisomie Chromosom 12
esSíndrome de trisomía 12 en mosaicoTrisomía del cromosoma 12 en mosaico
itSindrome trisomia 12 in mosaicoTrisomia del cromosoma 12 in mosaico · Trisomia 12 in mosaico
nlMozaïektrisomie 12-syndroomMozaïektrisomie chromosoom 12 · Trisomie 12 mozaïcisme
ptTrissomia 12 em mosaico
plZespół mozaikowej trisomii chromosomu 12= en
csMozaiková forma trizomie 12= en
ukМозаїчна трисомія 12Мозаїчна трисомія хромосоми 12 · Трисомія 12 мозаїчність
zh12号染色体嵌合三倍体嵌合12号染色体三体
trMozaik trizomi 12Trizomi 12 mozaisizmi · Mozaik trizomi kromozomu 12

Definition in:

2

Cross-references

qualifier = Orphanet mapping relation
SourceCodeQualifierICD relationValidation
ICD-10Q92.1NTBTattributedvalidated
ICD-11LD40.YNTBTattributedvalidated
MONDO0015718Evalidated
UMLSC4706889Evalidated
GARD5304Evalidated

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

1 record
TypeClassValueAreaQualificationValidationSource
Point prevalence<1 / 1 000 000—WorldwideClass onlyValidatedORPHANET_28345774[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

19 annotations · validated 2024-12-11
HPOTerm (as annotated by Orphanet)Diagnostic
Frequent (79-30%)
HP:0000286Epicanthus
HP:0001263Global developmental delay
HP:0001252Hypotonia
HP:0000369Low-set ears
HP:0000358Posteriorly rotated ears
HP:0000431Wide nasal bridge
Occasional (29-5%)
HP:0001627Abnormal heart morphology
HP:0000337Broad forehead
HP:0007483Depigmentation/hyperpigmentation of skin
HP:0000365Hearing impairment
HP:0100790Hernia
HP:0000316Hypertelorism
HP:6000010Linear Hyperpigmentation along Blaschko's lines
HP:0000639Nystagmus
HP:0001561Polyhydramnios
HP:0000508Ptosis
HP:0002650Scoliosis
HP:0000470Short neck
HP:0004322Short stature

Annotation source: 36316743[PMID]_34260009[PMID]_28345774[PMID]_23548227[PMID]

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Sources for this card