raremaprare-disease reference indexOrphadata 2026-06-23 · HPO 2026-09-01
ORPHA:97548

Right isomerism

Synonyms: Ivemark syndrome · RAI · Right atrial isomerism

Type
Clinical subtype
Group
Subtype of disorder
Inheritance
Autosomal recessive
Age of onset
Neonatal
Status
active

A form of heterotaxy characterized by both atrial appendages having the morphology of a right atrial appendage, often associated with two morphologically right lungs and/or bronchi, and asplenia. Associated cardiovascular defects are frequent, including dextrocardia or mesocardia, common atrioventricular junction (atrioventricular septal defect), ventricular hypoplasia in half of cases, anomalous ventriculo-arterial connections (malposition or transposition of the great arteries), anomalous systemic and pulmonary venous connections (total anomalous pulmonary venous return), absent coronary sinus, and frequent subpulmonary stenosis. Cardiac arrhythmias are frequently observed. Typical extracardiac anomalies are midline liver, intestinal malrotation.

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Names in Orphadata languages

12 of 12 languages
LangNameSynonyms
enRight isomerismIvemark syndrome · RAI · Right atrial isomerism
frIsomérisme droitIsomérisme atrial droit · Syndrome d'Ivemark
deRechtsisomerieIvemark-Syndrom · RAI · Rechtsatriale Isomerie
esIsomerismo derechoIsomerismo auricular derecho · Síndrome de Ivemark
itIsomerismo destroRAI · Sindrome di Ivemark
nlRechter isomerieRechter atriaal isomerisme · RAI · Rechter atriale isomerie · Syndroom van Ivemark
ptIsomerismo direitoRAI · Isomerismo auricular direito
plZespół IvemarkaIzomeryzm prawostronny
csIvemarkův syndrom= en
ukПравобічна ізомерія передсердьІзомерія правого передсердного відростка · Синдром Айвемарка · RAI
zh右侧心房异构右心耳异构
trSağ atriyal izomerizmRAI · Ivemark sendromu · Sağ atriyal apendaj izomerizmi

Definition in:

2

Cross-references

qualifier = Orphanet mapping relation
SourceCodeQualifierICD relationValidation
OMIM208530BTNTvalidated
OMIM621079BTNTvalidated
ICD-10Q20.6NTBTattributedvalidated
ICD-11LA8YNTBTindexvalidated
MONDO0008832Evalidated
UMLSC3178806Evalidated
GARD6795Evalidated
MedDRA10068335Evalidated

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
GDF1Disease-causing germline mutation(s) inAssessedHGNC:4214ENSG0000013028360288019p13.11growth differentiation factor 120413652[PMID]
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Prevalence and incidence

2 records
TypeClassValueAreaQualificationValidationSource
Point prevalenceUnknown—FranceClass onlyValidated9562017[PMID]_25752370[PMID]_34631807[PMID]_ORPHANET
Prevalence at birth1-5 / 10 00016.67 / 100 000FranceValue and classValidated8308205[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

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

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Sources for this card