raremaprare-disease reference indexOrphadata 2026-06-23 · HPO 2026-09-01
ORPHA:3250

Proximal symphalangism

Synonyms: Symphalangism, Cushing type

Type
Malformation syndrome
Group
Disorder
Inheritance
Autosomal dominant
Age of onset
Infancy, Neonatal
Status
active

A rare genetic bone disorder characterized by ankylosis of the proximal interphalangeal joints, carpal and tarsal bone fusion, and conductive hearing loss in some patients.

1

Names in Orphadata languages

12 of 12 languages
LangNameSynonyms
enProximal symphalangismSymphalangism, Cushing type
frSymphalangie proximaleSymphalangie type Cushing
deSymphalangismus, proximalerCushing-Symphalangie
esSinfalangismo proximalSinfalangismo familiar proximal · Sinfalangismo tipo Cushing
itSinfalangismo prossimaleSinfalangismo familiare prossimale · Sinfalangismo, tipo Cushing
nlProximaal symfalangismeSymfalangisme, Cushing-type
ptSinfalangia proximalSinfalangia, tipo Cushing
plSymfalangizm proksymalnySymfalangizm, typu Cushinga
csProximální symfalangismusSymfalangismus, Cushingův typ
ukПроксимальний симфалангізмСимфалангізм, тип Кушинга
zh近端指关节粘连指(趾)关节粘连,Cushing型
trProksimal simfalanjizmSymphalangism, Cushing tipi

Definition in:

2

Cross-references

qualifier = Orphanet mapping relation
SourceCodeQualifierICD relationValidation
OMIM185800Evalidated
OMIM615298BTNTvalidated
ICD-10Q70.9NTBTattributedvalidated
ICD-11LB90.YNTBTindexvalidated
MONDO0008511Evalidated
MeSHC536223Evalidated
UMLSC1861385Evalidated
GARD8182Evalidated

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

2 direct
GeneAssociationStatusHGNCEnsemblOMIMLocusNameSource of validation
GDF5Disease-causing germline mutation(s) (gain of function) inAssessedHGNC:4220ENSG0000012596560114620q11.22growth differentiation factor 518283415[PMID]_16892395[PMID]
NOGDisease-causing germline mutation(s) inAssessedHGNC:7866ENSG0000018369160299117q22noggin11846737[PMID]_24326127[PMID]
5

Prevalence and incidence

1 record
TypeClassValueAreaQualificationValidationSource
Point prevalenceUnknown—WorldwideClass onlyNot yet validatedORPHANET

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

15 annotations · validated 2016-06-01
HPOTerm (as annotated by Orphanet)Diagnostic
Very frequent (99-80%)
HP:0100490Camptodactyly of finger
HP:0100264Proximal symphalangism
HP:0005048Synostosis of carpal bones
HP:0008368Tarsal synostosis
Frequent (79-30%)
HP:0005916Abnormal metacarpal morphology
HP:0001156Brachydactyly
HP:0003070Elbow ankylosis
HP:0003042Elbow dislocation
HP:0040019Finger clinodactyly
HP:0005880Metacarpophalangeal synostosis
HP:0000407Sensorineural hearing impairment
Occasional (29-5%)
HP:0003019Abnormality of the wrist
HP:0004209Clinodactyly of the 5th finger
HP:0006101Finger syndactyly
HP:0000486Strabismus

Run the differential on the 4 obligate / very frequent terms

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Sources for this card