raremaprare-disease reference indexOrphadata 2026-06-23 · HPO 2026-09-01
ORPHA:3237

Multiple synostoses syndrome

Synonyms: Deafness-Hermann type symphalangism syndrome · Facio-audio-symphalangism · Hearing loss-Hermann type symphalangism syndrome · Symphalangism-brachydactyly syndrome · WL syndrome

Type
Malformation syndrome
Group
Disorder
Inheritance
Autosomal dominant
Age of onset
Childhood
Status
active

Multiple synostoses syndrome (MSS) is a rare developmental bone disorder characterized by proximal symphalangism of the fingers and/or toes often associated with fusion of carpal and tarsal, humeroradial, and cervical spine joints.

1

Names in Orphadata languages

12 of 12 languages
LangNameSynonyms
enMultiple synostoses syndromeDeafness-Hermann type symphalangism syndrome · Facio-audio-symphalangism · Hearing loss-Hermann type symphalangism syndrome · Symphalangism-brachydactyly syndrome · WL syndrome
frSyndrome des synostoses multiplesSyndrome WL · Syndrome de surdité-symphalangie type Hermann · Syndrome de symphalangie-brachydactylie · Facio-audio-symphalangie
deMultiple SynostosenFazio-audio-Symphalangie · Schwerhörigkeit - Symphalangie-Syndrom, Typ Hermann · Symphalangie - Brachydaktylie · WL-Syndrom
esSíndrome de sinostosis múltipleFacio-audio-sinfalangismo · Sinfalangismo-braquidactilia · Síndrome WL · Síndrome de WL · Síndrome de hipoacusia-sinfalangismo tipo Hermann · Síndrome de sordera-sinfalangismo tipo Hermann
itSindrome da sinostosi multipleFacio-audio-sinfalangismo · Sindrome WL · Sindrome sordità-sinfalangismo, tipo Hermann · Sinfalangismo - brachidattilia
nlMeervoudige synostosen-syndroomDoofheid - symfalangisme syndroom, Hermann-type · Facio-audio-symfalangisme · Symfalangisme - brachydactylie-syndroom · WL-syndroom
ptSíndrome de sinostoses múltiplasFacio-audio-sinfalangia · Síndrome WL · Síndrome de perda auditiva-sinfalangia de Hermann · Síndrome de sinfalangia-braquidactilia · Síndrome de surdez-sinfalangia de Hermann
plZespół mnogich kościozrostówFacio-audio-symphalangism · Symfalangizm-brachydaktylia · Zespół głuchota - symfalangizm typu Hermanna · Zespół WL
csSyndrom mnohočetných synostózFacioaudiosymfalangismus · Syndrom zahrnující symfalangismus a brachydaktylii · WL syndrom · Syndrom zahrnující hluchotu a Hermannův typ symfalangismu
ukСиндром множинних синостозівСиндром симфалангізму типу глухоти-Германа · Фаціо-аудіо-симфалангізм · Синдром втрати слуху - симфалангізм типу Германа · Синдром симфалангізму-брахідактилії · Синдром WL
zh多发骨性结合综合征听力丧失-Hermann型指(趾)关节粘连综合征
trÇoklu sinostoz sendromuWL sendromu · Fasiyo-audio-semfalangizm · Semfalangizm-brakidaktili sendromu · Sağırlık-Hermann tipi semfalangizm sendromu · İşitme kaybı-Hermann tipi semfalangizm sendromu

Definition in:

2

Cross-references

qualifier = Orphanet mapping relation
SourceCodeQualifierICD relationValidation
OMIM186500BTNTvalidated
OMIM610017BTNTvalidated
OMIM612961BTNTvalidated
OMIM617898BTNTvalidated
ICD-10Q78.8NTBTattributedvalidated
ICD-11LD26.3NTBTindexvalidated
MONDO0017923Evalidated
UMLSC0175700Evalidated

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 (2):

No children.

4

Genes

4 direct
GeneAssociationStatusHGNCEnsemblOMIMLocusNameSource of validation
GDF5Disease-causing germline mutation(s) (gain of function) inAssessedHGNC:4220ENSG0000012596560114620q11.22growth differentiation factor 516532400[PMID]
FGF9Disease-causing germline mutation(s) inAssessedHGNC:3687ENSG0000010267860092113q12.11fibroblast growth factor 919589401[PMID]
GDF6Disease-causing germline mutation(s) inAssessedHGNC:4221ENSG000001564666011478q22.1growth differentiation factor 629130651[PMID]
NOGDisease-causing germline mutation(s) inAssessedHGNC:7866ENSG0000018369160299117q22noggin20503332[PMID]_25241334[PMID]
5

Prevalence and incidence

2 records
TypeClassValueAreaQualificationValidationSource
Cases/families30 familiesWorldwideFamily(ies)ValidatedORPHANET
Point prevalence<1 / 1 000 000—WorldwideClass onlyValidatedORPHANET

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

10 annotations · validated 2017-10-17
HPOTerm (as annotated by Orphanet)Diagnostic
Very frequent (99-80%)
HP:0001156Brachydactyly
HP:0000405Conductive hearing impairment
HP:0001387Joint stiffness
HP:0004279Short palm
HP:0009773Symphalangism affecting the phalanges of the hand
Frequent (79-30%)
HP:0007598Bilateral single transverse palmar creases
HP:0011304Broad thumb
HP:0010579Cone-shaped epiphysis
Occasional (29-5%)
HP:0001597Abnormal nail morphology
HP:0000324Facial asymmetry

Run the differential on the 5 obligate / very frequent terms

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Sources for this card