raremaprare-disease reference indexOrphadata 2026-06-23 · HPO 2026-09-01
ORPHA:293925

Lethal occipital encephalocele-skeletal dysplasia syndrome

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

Lethal occipital encephalocele-skeletal dysplasia syndrome is a rare, genetic, bone development disorder characterized by occipital and parietal bone hypoplasia leading to occipital encephalocele, calvarial mineralization defects, craniosynostosis, radiohumeral fusions, oligodactyly and other skeletal anomalies (arachnodactyly, terminal phalangeal aplasia of the thumbs, bilateral absence of the great toes, pronounced bilateral angulation of femora, shortened limbs, advanced osseous maturation). Fetal death in utero is associated.

1

Names in Orphadata languages

12 of 12 languages
LangNameSynonyms
enLethal occipital encephalocele-skeletal dysplasia syndrome
frSyndrome létal d'encéphalocèle occipital-dysplasie squelettique
deLetal okzipitale Enzephalozele-Skelettdysplasie-Syndrom
esSíndrome letal de encefalocele occipital-displasia esquelética
itSindrome letale da encefalocele occipitale e displasia scheletrica
nlLetale occipitale encefalocele - skeletdysplasie-syndroom
ptSíndrome letal de encefalocelo occipital-displasia esquelética
plŚmiertelny zespół przepuklina mózgowa potyliczna-dysplazja szkieletowa
csSyndrom zahrnující okcipitální encefalokélu a kosterní dysplázii, letální varianta
ukЛетальний синдром потиличного енцефалоцеле-скелетної дисплазії
zh致死性枕脑膨出-骨骼发育不良综合征
trLetal oksipital ensefalosel-iskelet displazisi sendromu

Definition in:

2

Cross-references

qualifier = Orphanet mapping relation
SourceCodeQualifierICD relationValidation
OMIM614416Evalidated
ICD-10Q87.5NTBTattributedvalidated
MONDO0013740Evalidated
UMLSC4751129Evalidated

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

1 direct
GeneAssociationStatusHGNCEnsemblOMIMLocusNameSource of validation
CYP26B1Disease-causing germline mutation(s) (loss of function) inAssessedHGNC:20581ENSG000000031376052072p13.2cytochrome P450 family 26 subfamily B member 122019272[PMID]
5

Prevalence and incidence

2 records
TypeClassValueAreaQualificationValidationSource
Cases/families5 casesWorldwideCase(s)Validated27410456[PMID]
Point prevalence<1 / 1 000 000—WorldwideClass onlyValidatedORPHANET_27410456[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.

7

Sources for this card