raremaprare-disease reference indexOrphadata 2026-06-23 · HPO 2026-09-01
ORPHA:50945

Blomstrand lethal chondrodysplasia

Synonyms: BLC · BOCD · Blomstrand chondrodysplasia · Blomstrand osteochondrodysplasia · Chondrodysplasia, Blomstrand type

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

Blomstrand lethal chondrodysplasia (BLC) is a neonatal osteosclerotic dysplasia characterized by advanced endochondral bone maturation, very short limbs, dwarfism and prenatal lethality.

1

Names in Orphadata languages

12 of 12 languages
LangNameSynonyms
enBlomstrand lethal chondrodysplasiaBLC · BOCD · Blomstrand chondrodysplasia · Blomstrand osteochondrodysplasia · Chondrodysplasia, Blomstrand type
frChondrodysplasie létale de BlomstrandBLC · BOCD · Chondrodysplasie de Blomstrand · Chondrodysplasie type Blomstrand · Ostéochondrodysplasie de Blomstrand
deChondrodysplasie Typ BlomstrandBLC · BOCD · Blomstrand letale Chondrodysplasie
esCondrodisplasia de Blomstrand letalBLC · BOCD · Condrodisplasia de Blomstrand · Condrodisplasia, tipo Blomstrand · Osteocondrodisplasia de Blomstrand
itCondrodisplasia letale di BlomstrandBLC · BOCD · Condrodisplasia di Blomstrand · Condrodisplasia tipo Blomstrand · Osteocondrodisplasia di Blomstrand
nlLetale chondrodysplasie van BlomstrandBLC · BOCD · Chondrodysplasie van Blomstrand · Chondrodysplasie, Blomstrand-type · Osteochondrodysplasie van Blomstrand
ptCondrodisplasia fatal BlomstrandBLC · BOCD · Condrodisplasia Blomstrand · Osteocondrodisplasia Blomstrand
plChondrodysplazja typu BlomstrandaBLC · Śmiertelna chondrodysplazja Blomstranda · Letalna chondrodysplazja Blomstranda
csBlomstrandova letální chondrodysplázieBLC · BOCD · Blomstrandova chondrodysplázie · Blomstrandova osteochondrodysplázie · Chondrodysplázie, Blomstrandův typ
ukЛетальна хондродисплазія БломстрандаBLC · Хондродисплазія Бломстранда · Остеохондродисплазія Бломстранда · BOCD · Хондродисплазія, тип Бломстранда
zhBlomstrand型致死性软骨发育不良骨软骨发育不良Blomstrand型
trBlomstrand letal kondrodisplaziBLC · BOCD · Blomstrand kondrodisplazi · Blomstrand osteokondrodisplazi · Kondrodisplazi, Blomstrand tipi

Definition in:

2

Cross-references

qualifier = Orphanet mapping relation
SourceCodeQualifierICD relationValidation
OMIM215045Evalidated
ICD-10Q78.8NTBTattributedvalidated
ICD-11LD24.1YNTBTindexvalidated
MONDO0008970Evalidated
MeSHC537914Evalidated
UMLSC1859148Evalidated
GARD914Evalidated

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 (3):

No children.

4

Genes

1 direct
GeneAssociationStatusHGNCEnsemblOMIMLocusNameSource of validation
PTH1RDisease-causing germline mutation(s) inAssessedHGNC:9608ENSG000001608011684683p21.31parathyroid hormone 1 receptor9832466[PMID]_9745456[PMID]_9649554[PMID]
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Prevalence and incidence

2 records
TypeClassValueAreaQualificationValidationSource
Cases/families13 casesWorldwideCase(s)Validated27353973[PMID]
Point prevalence<1 / 1 000 000—WorldwideClass onlyValidatedORPHANET_27353973[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

37 annotations · validated 2016-06-01
HPOTerm (as annotated by Orphanet)Diagnostic
Very frequent (99-80%)
HP:0005930Abnormality of epiphysis morphology
HP:0005616Accelerated skeletal maturation
HP:0006660Aplastic clavicles
HP:0000916Broad clavicles
HP:0000518Cataract
HP:0005280Depressed nasal bridge
HP:0006402Distal shortening of limbs
HP:0003015Flared metaphysis
HP:0011001Increased bone mineral density
HP:0005716Lethal skeletal dysplasia
HP:0000369Low-set ears
HP:0000272Malar flattening
HP:0003027Mesomelia
HP:0003021Metaphyseal cupping
HP:0000347Micrognathia
HP:0000774Narrow chest
HP:0008921Neonatal short-limb short stature
HP:0000926Platyspondyly
HP:0001561Polyhydramnios
HP:0001622Premature birth
HP:0000520Proptosis
HP:0001538Protuberant abdomen
HP:0002089Pulmonary hypoplasia
HP:0008905Rhizomelia
HP:0003196Short nose
HP:0000773Short ribs
HP:0010306Short thorax
HP:0000506Telecanthus
Frequent (79-30%)
HP:0000463Anteverted nares
HP:0006487Bowing of the long bones
HP:0001789Hydrops fetalis
HP:0000343Long philtrum
HP:0000695Natal tooth
HP:0010808Protruding tongue
HP:0010049Short metacarpal
HP:0100240Synostosis of joints
Occasional (29-5%)
HP:0001680Coarctation of aorta

Run the differential on the 12 obligate / very frequent terms

Annotation source: ISBN:0195214749[OTHER]_10664159[PMID]

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Sources for this card