raremaprare-disease reference indexOrphadata 2026-06-23 · HPO 2026-09-01
ORPHA:622925

X-linked severe syndromic thoracic aortic aneurysm and dissection

Synonyms: Meester-Loeys syndrome · X-linked severe syndromic TAAD

Type
Malformation syndrome
Group
Disorder
Inheritance
X-linked recessive
Age of onset
Adolescent, Childhood, Infancy
Status
active

A rare genetic systemic syndrome characterized by early-onset aortic aneurysm (involving the aortic root/ more distal ascending aorta) and dissection. Mild mitral or aortic insufficiency may also be present. Majority of the patients present with variable facial dysmorphism including frontal bossing, hypertelorism, downslanting palpebral fissures, proptosis and malar hypoplasia. Additional clinical features may include joint hypermobility, contractures, and mild skeletal dysplasia.

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Names in Orphadata languages

10 of 12 languages
LangNameSynonyms
enX-linked severe syndromic thoracic aortic aneurysm and dissectionMeester-Loeys syndrome · X-linked severe syndromic TAAD
frAnévrisme de l'aorte thoracique et dissection aortique, forme syndromique sévère liée à l'XSyndrome de Meester-Loeys · TAAD syndromique sévère lié à l'X
deX-chromosomales schweres thorakales Aortenaneurysma mit DissektionMeester-Loeys-Syndrom · X-chromosomales schweres thorakales TAAD
esDisección y aneurisma de la aorta torácica sindrómica grave ligada al cromosoma XSíndrome de Meester-Loeys · TAAD sindrómico grave ligado al cromosoma X
itGrave aneurisma e dissecazione sindromica dell’aorta toracica legata all’XSindrome di Meester-Loeys · TAAD sindromica grave legata all’X
nlX-gebonden ernstige syndromale aneurysma en dissectie van aorta thoracicaSyndroom van Meester-Loeys · X-gebonden ernstige syndromale TAAD · X-gebonden ernstige syndromale aneurysma en dissectie van thoracale aorta
ptAneurisma e disseção da aorta torácica sindromática grave ligada ao XTAAD sindromática grave ligada ao X
plSprzężone z chromosomem X ciężkie syndromiczne rozwarstwienie i tętniak aorty= en
csX-vázaný syndrom těžkého aneuryzmatu a disekce hrudní aorty= en
ukХ-зчеплена тяжка синдромна аневризма та розшарування грудного відділу аортиСиндром Местера-Лойса · Х-зчеплений тяжкий синдром TAAD

Definition in:

2

Cross-references

qualifier = Orphanet mapping relation
SourceCodeQualifierICD relationValidation
OMIM300989Evalidated
ICD-10I71.1NTBTattributedvalidated
ICD-11BD50.3NTBTattributedvalidated
ICD-11BD50.30NTBTattributedvalidated
MONDO0850095Evalidated
UMLSC4310811Evalidated

E exact · NTBT this ORPHAcode is narrower than the target · BTNT broader than the target · ND not decided.

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Classification

Preferential parent (Orphanet linearisation):

Parents in the classifications (3):

No children.

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Genes

1 direct
GeneAssociationStatusHGNCEnsemblOMIMLocusNameSource of validation
BGNDisease-causing germline mutation(s) (loss of function) inAssessedHGNC:1044ENSG00000182492301870Xq28biglycan27632686[PMID]
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Prevalence and incidence

2 records
TypeClassValueAreaQualificationValidationSource
Cases/families32 casesWorldwideCase(s)Validated27632686[PMID]_34807424[PMID]
Point prevalence<1 / 1 000 000—WorldwideClass onlyValidated27632686[PMID]_34807424[PMID]_ORPHANET

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