raremaprare-disease reference indexOrphadata 2026-06-23 · HPO 2026-09-01
ORPHA:329332

Microcephaly-cerebellar hypoplasia-cardiac conduction defect syndrome

Synonyms: Microcephaly-cerebellar hypoplasia-congenital heart conduction defect syndrome

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

Microcephaly-cerebellar hypoplasia-cardiac conduction defect syndrome is a rare, genetic congenital anomalies/dysmorphic syndrome characterized by growth failure, global developmental delay, profound intellectual disability, autistic behaviors, acquired second-degree heart block with bradycardia and vasomotor instability. Hands and feet present with long fusiform fingers, campto-clinodactyly and crowded toes while craniofacial dysmorphism includes microcephaly, broad forehead, thin eyebrows, upslanting palpebral fissures, large ears with prominent antihelix, prominent nose, long philtrum, thin upper lip vermillion and prominent lower lip. Neurological signs include hypotonia, brisk reflexes, dystonic-like movements and truncal ataxia and imaging shows cerebellar hypoplasia and simplified gyral pattern.

1

Names in Orphadata languages

12 of 12 languages
LangNameSynonyms
enMicrocephaly-cerebellar hypoplasia-cardiac conduction defect syndromeMicrocephaly-cerebellar hypoplasia-congenital heart conduction defect syndrome
frSyndrome de microcéphalie-hypoplasie cérébelleuse-trouble de la conduction cardiaque
deMikrozephalie-zerebelläre Hypoplasie-kardiale Reizleitungsstörung-Syndrom
esSíndrome de microcefalia-hipoplasia cerebelosa-trastorno de la conducción cardíacaSíndrome de microcefalia-hipoplasia cerebelosa-trastorno de la conducción cardíaca congénita
itSindrome da microcefalia-ipoplasia cerebellare-difetto della conduzione cardiaca
nlMicrocefalie - hypoplasie van cerebellum - hartgeleidingsstoornis-syndroomMicrocefalie - cerebellaire hypoplasie - congenitale hartgeleidingsstoornis-syndroom
ptSíndrome de microcefalia-hipoplasia cerebelosa-defeito cardíaco de conduçãoSíndrome de microcefalia-hipoplasia cerebelosa-defeito cardíaco de condução congénito
plZespół mikrocefalia-hipoplazja móżdżku-zaburzenia przewodzenia w sercuZespół mikrocefalia-hipoplazja móżdżku-wrodzone zaburzenia przewodzenia w sercu
csSyndrom zahrnující mikrocefalii, hypoplázii mozečku a poruchu srdečního vedeníSyndrom zahrnující mikrocefalii, hypoplázii mozečku a vrozenou poruchu srdečního vedení
ukСиндром мікроцефалії - гіпоплазії мозочка - вади серцевої провідностіСиндром мікроцефалії - гіпоплазії мозочка - вродженої вади серцевої провідності
zh小头畸形-小脑发育不全-心脏传导缺损综合征小头畸形-小脑发育不全-先天性心脏传导缺陷综合征
trMikrosefali-serebellar hipoplazi-kardiyak iletim bozukluğu sendromuMikrosefali-serebellar hipoplazi-doğumsal kalp iletim defekti sendromu

Definition in:

2

Cross-references

qualifier = Orphanet mapping relation
SourceCodeQualifierICD relationValidation
OMIM614407Evalidated
ICD-10Q87.8NTBTattributedvalidated
MONDO0013735Evalidated
UMLSC3280692Evalidated

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

0 direct

Orphanet records no gene directly on this code.

5

Prevalence and incidence

2 records
TypeClassValueAreaQualificationValidationSource
Cases/families4 casesWorldwideCase(s)Validated22002884[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.

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HPO phenotypes

Orphanet has no HPO annotation for this code in this release.

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Sources for this card