raremaprare-disease reference indexOrphadata 2026-06-23 · HPO 2026-09-01
ORPHA:477831

Kosaki overgrowth syndrome

Synonyms: Skeletal overgrowth-craniofacial dysmorphism-hyperelastic skin-white matter lesions syndrome

Type
Malformation syndrome
Group
Disorder
Inheritance
No data available
Age of onset
Infancy
Status
active

A rare genetic multiple congenital anomalies/dysmorphic syndrome characterized by postnatal tall stature with long hands and feet, scoliosis, distinctive dysmorphic facial features (prominent forehead, proptosis, downslanting palpebral fissures, broad nasal bridge, thin upper lip, and pointed chin), hyperelastic, thin, and fragile skin, lipodystrophy, and variable intellectual disability and neurological deterioration. Additional reported manifestations include craniosynostosis, camptodactyly, progressive flexion contractures, joint dislocation, and cerebrovascular complications, among others. Brain MRI may show extensive periventricular white matter lesions and other anomalies.

1

Names in Orphadata languages

12 of 12 languages
LangNameSynonyms
enKosaki overgrowth syndromeSkeletal overgrowth-craniofacial dysmorphism-hyperelastic skin-white matter lesions syndrome
frSyndrome hypertrophique de KosakiSyndrome d'hypercroissance de Kosaki · Syndrome de dysmorphie craniofaciale-hyperélasticité de la peau-lésions de la substance blanche
deKosaki-Großwuchs-SyndromSkelettaler Großwuchs-kraniofaziale Dysmorphien-hyperelastische Haut-Läsionen der weissen Substanz-Syndrom
esSíndrome de sobrecrecimiento de KosakiSíndrome de sobrecrecimiento esquelético-dismorfia craneofacial-piel hiperelástica-lesiones en la sustancia blanca
itSindrome da iperaccrescimento di KosakiSindrome da iperaccrescimento scheletrico-dismorfismi craniofacciali-iperelasticità cutanea-lesioni della sostanza bianca
nlOvergroeisyndroom van KosakiSkeletale overgroei - craniofaciale dysmorfie - hyperelastische huid - laesies van witte stof-syndroom
ptSíndrome de sobrecrescimento KosakiSíndrome de sobrecrescimento esquelético-dismorfia craniofacial-hiperelasticidade cutânea-lesões da substância branca
plZespół nadmiernego wzrastania, dysmorfii czaszkowo-twarzowej, hiperplastycznej skóry i zmian w istocie białejZespół nadmiernego wzrastania Kosakiego · Zespół przerostu Kosaki
csSyndrom nadměrného růstu kostí, kraniofaciálního dysmorfismu, hyperplastické kůže a lézí bílé hmotyKosaki overgrowth syndrome · Kosakiho syndrom přerůstání
ukСиндром надмірного росту КосакіСиндром скелетного розростання - черепно-лицьового дисморфізму - гіпереластичної шкіри - ураження білої речовини
zh骨骼过度生长-颅面畸形-皮肤弹性过强-白质病变综合征Kosaki过度增生综合征
trİskelet büyümesi-kraniyofasiyal dismorfizm-hiperelastik deri-beyaz madde lezyonları sendromuKosaki aşırı büyüme sendromu

Definition in:

2

Cross-references

qualifier = Orphanet mapping relation
SourceCodeQualifierICD relationValidation
OMIM616592Evalidated
ICD-10Q87.3NTBTattributedvalidated
ICD-11LD2CNTBTattributedvalidated
MONDO0014704Evalidated
UMLSC4225270Evalidated
MedDRA10081313Evalidated

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 (1):

No children.

4

Genes

1 direct
GeneAssociationStatusHGNCEnsemblOMIMLocusNameSource of validation
PDGFRBDisease-causing germline mutation(s) inAssessedHGNC:8804ENSG000001137211734105q32platelet derived growth factor receptor beta25454926[PMID]_26455322[PMID]
5

Prevalence and incidence

2 records
TypeClassValueAreaQualificationValidationSource
Cases/families2 casesWorldwideCase(s)Validated25454926[PMID]_26455322[PMID]
Point prevalence<1 / 1 000 000—WorldwideClass onlyValidatedORPHANET_25454926[PMID]_26455322[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

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

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Sources for this card