raremaprare-disease reference indexOrphadata 2026-06-23 · HPO 2026-09-01
ORPHA:157801

Mesoaxial synostotic syndactyly with phalangeal reduction

Synonyms: MSSD · Syndactyly type 9 · Syndactyly, Malik-Percin type

Type
Morphological anomaly
Group
Disorder
Inheritance
Autosomal recessive
Age of onset
Infancy, Neonatal
Status
active

A rare non-syndromic syndactyly characterized by mesoaxial reduction of fingers, complete syndactyly of the 3rd and 4th fingers with synostoses of the corresponding metacarpals and associated single phalanges, malformed thumbs, and hypoplasia and clinodactyly of the 5th finger. Preaxial webbing of toes with terminal phalangeal hypoplasia of all toes has been reported in association.

1

Names in Orphadata languages

12 of 12 languages
LangNameSynonyms
enMesoaxial synostotic syndactyly with phalangeal reductionMSSD · Syndactyly type 9 · Syndactyly, Malik-Percin type
frSyndactylie mésoaxiale synostosique avec réduction phalangienneMSSD · Syndactylie type 9 · Syndactylie type Malik-Percin
deMesoaxiale synostotische Syndaktylie mit phalangealer ReduktionSyndaktylie Typ 9 · Syndaktylie Typ Malik-Percin
esSindactilia mesoaxial sinostótica con reducción de las falangesMSSD · Sindactilia tipo 9 · Sindactilia tipo Malik-Percin
itSindattilia sinostosica mesoassiale con riduzione delle falangiMSSD · Sindattilia, tipo 9 · Sindattilia, tipo Malik-Percin
nlMesoaxiale synostotische syndactylie met falangeale reductieMSSD · Syndactylie type 9 · Syndactylie, Malik-Percin-type
ptSindactilia sinostótica mesoaxial com redução das falanges
plSyndaktylia międzyosiowa ze skróceniem paliczkówMSSD · Syndaktylia typu 9 · Syndaktylia, typ Malika i Percina
csMesoaxiální synostotická syndaktylie s redukcí falangůMSSD · Syndaktylie, typ 9 · Syndaktylie, typ Malikův-Percinové · Syndaktylie, typ Malik-Percinové
ukМезоаксіальна синостотична синдактилія з редукцією фаланг пальцівMSSD · Синдактилія типу 9 · Синдактилія, тип Маліка-Персена
zh骨性融合并指联合指骨骨量减少症并指Malik-Percin型
trFalangeal redüksiyon ile seyreden mezoaksiyal sinostotik sindaktiliMSSD · Sindaktili tip 9 · Sindaktili, Malik-Percin tipi

Definition in:

2

Cross-references

qualifier = Orphanet mapping relation
SourceCodeQualifierICD relationValidation
OMIM609432Evalidated
ICD-10Q70.0NTBTattributedvalidated
ICD-10Q70.2NTBTattributedvalidated
ICD-11LB79.YNTBTindexvalidated
MONDO0012271Evalidated
UMLSC1836206Evalidated
GARD10590Evalidated

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
BHLHA9Disease-causing germline mutation(s) inAssessedHGNC:35126ENSG0000020589961541617p13.3basic helix-loop-helix family member a925466284[PMID]
5

Prevalence and incidence

2 records
TypeClassValueAreaQualificationValidationSource
Cases/families6 familiesWorldwideFamily(ies)Validated25466284[PMID]
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

12 annotations · validated 2016-06-01
HPOTerm (as annotated by Orphanet)Diagnostic
Very frequent (99-80%)
HP:00046912-3 toe syndactyly
HP:0008362Aplasia/Hypoplasia of the hallux
HP:0009843Aplasia/Hypoplasia of the middle phalanges of the hand
HP:0004209Clinodactyly of the 5th finger
HP:0006101Finger syndactyly
HP:0009701Metacarpal synostosis
HP:0010109Short hallux
HP:0004279Short palm
HP:0009778Short thumb
HP:0009773Symphalangism affecting the phalanges of the hand
HP:0001770Toe syndactyly
Frequent (79-30%)
HP:0005048Synostosis of carpal bones

Run the differential on the 11 obligate / very frequent terms

Annotation source: 9783716[PMID]

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Sources for this card