raremaprare-disease reference indexOrphadata 2026-06-23 · HPO 2026-09-01
ORPHA:96201

X small rings syndrome

Type
Malformation syndrome
Group
Disorder
Age of onset
Antenatal, Neonatal
Status
active

X small rings is a rare chromosome X structural anomaly, with highly variable phenotype, principally characterized by developmental delay, intellectual disability, short stature, craniofacial dysmorphism (incl. microcephaly, facial asymmetry, hypertelorism, long palpebral fissures, epicanthus, low-set or malrotated ears, broad nose with a flat nasal bridge, anteverted nares, long philtrum, thin upper lip, high arched palate, micrognathia) and skeletal anomalies (e.g. cubitus valgus, talipes equinovarus). Patients may also present heart malformations (e.g. ventricular septal defects, mitral valve stenosis), sacral dimple, soft tissue syndactyly, pigmented nevi, and seizures.

1

Names in Orphadata languages

12 of 12 languages
LangNameSynonyms
enX small rings syndrome
frSyndrome des petits anneaux du x
deChromosom X, kleine Ringe
esSíndrome de pequeño cromosoma X en anillo
itSindrome cromosoma X a piccoli anelli
nlSyndroom van kleine X-ringchromosomen
ptCromossoma X em anel, pequeno
plZespół małych pierścieniowych chromosomów X
csMalé ring chromozomy XMalé kruhové chromozomy X
ukМаленька кільцева хромосома X
zh小环形X染色体
trKüçük halka X Kromozomu

Definition in:

2

Cross-references

qualifier = Orphanet mapping relation
SourceCodeQualifierICD relationValidation
ICD-10Q99.8NTBTattributedvalidated
ICD-11LD51NTBTindexvalidated
MONDO0019926Evalidated
UMLSC4707824Evalidated

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 (5):

No children.

4

Genes

0 direct

Orphanet records no gene directly on this code.

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Prevalence and incidence

0 records

No prevalence record in this release.

6

HPO phenotypes

40 annotations · validated 2015-11-23
HPOTerm (as annotated by Orphanet)Diagnostic
Very frequent (99-80%)
HP:0001999Abnormal facial shape
HP:0000463Anteverted nares
HP:0002616Aortic root aneurysm
HP:0001647Bicuspid aortic valve
HP:0000280Coarse facial features
HP:0007642Congenital stationary night blindness
HP:0012725Cutaneous syndactyly
HP:0000286Epicanthus
HP:0011968Feeding difficulties
HP:0001263Global developmental delay
HP:0001510Growth delay
HP:0000316Hypertelorism
HP:0001249Intellectual disability
HP:0010864Intellectual disability, severe
HP:0000637Long palpebral fissure
HP:0000343Long philtrum
HP:0002162Low posterior hairline
HP:0001718Mitral stenosis
HP:0001319Neonatal hypotonia
HP:0000939Osteoporosis
HP:0008209Premature ovarian insufficiency
HP:0000786Primary amenorrhea
HP:0000411Protruding ear
HP:0004349Reduced bone mineral density
HP:0000470Short neck
HP:0000486Strabismus
HP:0000219Thin upper lip vermilion
HP:0001770Toe syndactyly
HP:0001629Ventricular septal defect
Frequent (79-30%)
HP:0009816Lower limb undergrowth
HP:0001182Tapered finger
HP:0009824Upper limb undergrowth
Occasional (29-5%)
HP:00046912-3 toe syndactyly
HP:0002069Bilateral tonic-clonic seizure
HP:0004209Clinodactyly of the 5th finger
HP:0010945Fetal pyelectasis
HP:0001382Joint hypermobility
HP:0001562Oligohydramnios
HP:0001250Seizure
HP:0400000Tall chin

Run the differential on the 12 obligate / very frequent terms

Annotation source: 1415351[PMID]_10982188[PMID]_7665167[PMID]_8326492[PMID]_8079992[PMID]_8265665[PMID]

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Sources for this card