raremaprare-disease reference indexOrphadata 2026-06-23 · HPO 2026-09-01
ORPHA:238750

4q21 microdeletion syndrome

Synonyms: Del(4)(q21) · Monosomy 4q21

Type
Malformation syndrome
Group
Disorder
Inheritance
Not applicable, Unknown
Age of onset
Infancy, Neonatal
Status
active

The 4q21 microdeletion syndrome is a newly described syndrome associated with facial dysmorphism, progressive growth restriction, severe intellectual deficit and absent or severely delayed speech.

1

Names in Orphadata languages

12 of 12 languages
LangNameSynonyms
en4q21 microdeletion syndromeDel(4)(q21) · Monosomy 4q21
frSyndrome de microdélétion 4q21Del(4)(q21) · Monosomie 4q21
deMikrodeletionssyndrom 4q21Del(4)(q21) · Monosomie 4q21
esSíndrome de microdeleción 4q21Del(4)(q21) · Monosomía 4q21
itSindrome da microdelezione 4q21Del(4)(q21) · Monosomia 4q21
nl4q21-microdeletiesyndroomDel(4)(q21) · Monosomie 4q21
ptSíndrome de microdeleção 4q21
plZespół mikrodelecji 4q21Del(4)(q21) · Monosomia 4q21
csMikrodeleční syndrom 4q21Del(4)(q21) · Monozomie 4q21
ukСиндром мікроделеції 4q21Del(4)(q21) · Моносомія 4q21
zh染色体4q21微缺失综合征4q21单体
tr4q21 mikrodelesyon sendromuDel (4) (q21) · Monozomi 4q21

Definition in:

2

Cross-references

qualifier = Orphanet mapping relation
SourceCodeQualifierICD relationValidation
OMIM613509Evalidated
ICD-10Q93.5NTBTattributedvalidated
ICD-11LD44.40NTBTindexvalidated
MONDO0013292Evalidated
UMLSC4304530Evalidated

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

0 direct

Orphanet records no gene directly on this code.

5

Prevalence and incidence

2 records
TypeClassValueAreaQualificationValidationSource
Point prevalence<1 / 1 000 000—WorldwideClass onlyValidatedORPHANET
Cases/families14 casesWorldwideCase(s)Validated20522426[PMID]_22903878[PMID]_21834054[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

42 annotations · validated 2016-06-01
HPOTerm (as annotated by Orphanet)Diagnostic
Very frequent (99-80%)
HP:0000750Delayed speech and language development
HP:0001263Global developmental delay
HP:0001510Growth delay
HP:0001252Hypotonia
HP:0010864Intellectual disability, severe
HP:0011344Severe global developmental delay
Frequent (79-30%)
HP:0000337Broad forehead
HP:0005280Depressed nasal bridge
HP:0002007Frontal bossing
HP:0000293Full cheeks
HP:0000316Hypertelorism
HP:0000369Low-set ears
HP:0002983Micromelia
HP:0001773Short foot
HP:0000470Short neck
HP:0004279Short palm
HP:0000322Short philtrum
HP:0200055Small hand
Occasional (29-5%)
HP:0000733Abnormal repetitive mannerisms
HP:0000164Abnormality of the dentition
HP:0001274Agenesis of corpus callosum
HP:0000717Autism
HP:0001321Cerebellar hypoplasia
HP:0002714Downturned corners of mouth
HP:0002230Generalized hirsutism
HP:0000365Hearing impairment
HP:0000348High forehead
HP:0001511Intrauterine growth retardation
HP:0002808Kyphosis
HP:0000239Large fontanelles
HP:0000527Long eyelashes
HP:0000508Ptosis
HP:0002650Scoliosis
HP:0001250Seizure
HP:0100716Self-injurious behavior
HP:0002360Sleep abnormality
HP:0000486Strabismus
HP:0000664Synophrys
HP:0000233Thin vermilion border
HP:0001770Toe syndactyly
HP:0001337Tremor
HP:0002119Ventriculomegaly

Run the differential on the 6 obligate / very frequent terms

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Sources for this card