raremaprare-disease reference indexOrphadata 2026-06-23 · HPO 2026-09-01
ORPHA:268943

Unilateral polymicrogyria

Type
Morphological anomaly
Group
Disorder
Age of onset
Infancy, Neonatal
Status
active

Unilateral polymicrogyria is a cerebral cortical malformation characterized by unilateral excessive cortical folding and abnormal cortical layering. It comprises two sub-types depending on the areas affected: unilateral hemispheric and focal polymicrogyria.

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Names in Orphadata languages

12 of 12 languages
LangNameSynonyms
enUnilateral polymicrogyria
frPolymicrogyrie unilatérale
dePolymikrogyrie, unilaterale
esPolimicrogiria unilateral
itPolimicrogiria monolaterale
nlUnilaterale polymicrogyrie
ptPolimicrogiria unilateral
plDrobnozakrętowość/Polimikrogyria jednostronna
csUnilaterální polymikrogyrieNonlissencefalická kortikální dysplázie unilaterální
ukОдностороння полімікрогірія
zh单侧多小脑回
trUnilateral polimikrogri

Definition in:

2

Cross-references

qualifier = Orphanet mapping relation
SourceCodeQualifierICD relationValidation
ICD-10Q04.3NTBTattributedvalidated
ICD-11LA05.50NTBTindexvalidated
MONDO0017092Evalidated
UMLSC4024960Evalidated

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):

  • ORPHA:35981Polymicrogyria
    rare developmental anomalies during embryogenesis; rare genetic diseases; rare neurological diseases

Children (2):

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Genes

0 direct

Orphanet records no gene directly on this code.

5

Prevalence and incidence

1 record
TypeClassValueAreaQualificationValidationSource
Point prevalenceUnknown—WorldwideClass onlyNot yet validatedORPHANET

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 2019-03-25
HPOTerm (as annotated by Orphanet)Diagnostic
Frequent (79-30%)
HP:0002539Cortical dysplasia
HP:0010818Generalized tonic seizure
HP:0001269Hemiparesis
HP:0001249Intellectual disability
HP:0007010Poor fine motor coordination
HP:0007024Pseudobulbar paralysis
HP:0001250Seizure
HP:0002510Spastic tetraplegia
Occasional (29-5%)
HP:0001999Abnormal facial shape
HP:0002533Abnormal posturing
HP:0002104Apnea
HP:0012389Appendicular hypotonia
HP:0008936Axial hypotonia
HP:0000961Cyanosis
HP:0000750Delayed speech and language development
HP:0000421Epistaxis
HP:0000565Esotropia
HP:0002384Focal impaired awareness seizure
HP:0007359Focal-onset seizure
HP:0001312Giant somatosensory evoked potentials
HP:0008610Infantile sensorineural hearing impairment
HP:0012469Infantile spasms
HP:0001256Intellectual disability, mild
HP:0004305Involuntary movements
HP:0001270Motor delay
HP:0001336Myoclonus
HP:0012650Perisylvian polymicrogyria
HP:0002421Poor head control
HP:0006548Pulmonary arteriovenous malformation
HP:0011344Severe global developmental delay
HP:0002133Status epilepticus
HP:0001297Stroke
HP:0000505Visual impairment
Very rare (<4-1%)
HP:0001627Abnormal heart morphology
HP:0001335Bimanual synkinesia
HP:0000252Microcephaly
HP:0040288Nasogastric tube feeding

Annotation source: 20198472[PMID_26094545[PMID]_15626537[PMID]_20403963[PMID]_11376999[PMID]_29059488[PMID]_30584075[PMID]_28300030[PMID]

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Sources for this card