raremaprare-disease reference indexOrphadata 2026-06-23 · HPO 2026-09-01
ORPHA:3034

Delayed membranous cranial ossification

Synonyms: Gonzales-del Angel syndrome

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

Delayed membranous cranial ossification is a rare, genetic primary bone dysplasia characterized by absent ossification of calvarial bones at birth and characteristic facial dysmorphisms (frontal bossing, hypertelorism, downward-slanting palpebral fissures, proptosis, flat nasal bridge, low-set ears, midface retrusion). Patients present a soft skull at birth which, over time, progressively ossifies and in adulthood typically results in a deformed skull (with brachycephaly and prominent occiput). No other skeletal abnormalities are associated and patients have normal cognitive and motor development.

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Names in Orphadata languages

12 of 12 languages
LangNameSynonyms
enDelayed membranous cranial ossificationGonzales-del Angel syndrome
frRetard d'ossification du crâne membraneuxSyndrome de Gonzales-del Angel
deOssifikationsverzögerung des Schädels, membranöseGonzales-del-Angel-Syndrom
esRetraso de la osificación craneal membranosaSíndrome de Gonzales-del Ángel
itRitardo di ossificazione del cranio membranosoSindrome di Gonzales-del Angel
nlVertraagde membraneuze craniale ossificatieSyndroom van Gonzales-del Angel
ptAtraso na ossificação craniana membranosaSíndrome Gonzales-del Angel
plOpóźnienie kostnienia czaszkiZespół Gonzales del Angela
csOpožděná membranózní osifikace lebkyGonzalez-del Angelové syndrom
ukЗатримка мембранозного окостеніння черепаСиндром Гонсалеса-дель-Анхеля
zh颅骨膜性成骨延迟Gonzales-del Angel综合征
trGecikmiş membranöz kraniyal kemikleşmeGonzales-del Angel sendromu

Definition in:

2

Cross-references

qualifier = Orphanet mapping relation
SourceCodeQualifierICD relationValidation
OMIM155980Evalidated
ICD-10Q75.8NTBTattributedvalidated
ICD-11LB70.YNTBTindexvalidated
MONDO0007971Evalidated
MeSHC563592Evalidated
UMLSC1835030Evalidated
GARD1727Evalidated

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 (2):

No children.

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Genes

0 direct

Orphanet records no gene directly on this code.

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Prevalence and incidence

2 records
TypeClassValueAreaQualificationValidationSource
Cases/families2 familiesWorldwideFamily(ies)Validated10861662[PMID]_1481847[PMID]
Point prevalence<1 / 1 000 000—WorldwideClass onlyValidatedORPHANET_10861662[PMID]_1481847[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.

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HPO phenotypes

7 annotations · validated 2016-06-01
HPOTerm (as annotated by Orphanet)Diagnostic
Very frequent (99-80%)
HP:0004331Decreased skull ossification
HP:0000457Depressed nasal ridge
HP:0002007Frontal bossing
HP:0000316Hypertelorism
HP:0011800Midface retrusion
HP:0000582Upslanted palpebral fissure
Frequent (79-30%)
HP:0000269Prominent occiput

Run the differential on the 6 obligate / very frequent terms

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Sources for this card