raremaprare-disease reference indexOrphadata 2026-06-23 · HPO 2026-09-01
ORPHA:1642

Distal deletion 9p syndrome

Synonyms: Distal monosomy 9p · Monosomy 9pter · Telomeric deletion 9p

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

Distal monosomy 9p is a rare chromosomal anomaly syndrome, resulting from a partial deletion of the short arm of chromosome 9, with a highly variable phenotype typically characterized by intellectual disability, craniofacial dysmorphism (trigonocephaly, upslanting palpebral fissures, hypoplastic supraorbital ridges), abnormal digits (long middle phalanges with short distal phalanges), as well as frequent association with genitourinary abnormalities (cryptorchidism, hypospadias, ambiguous genitalia, 46,XY testicular dysgenesis). Congenital hypothyroidism and cardiovascular defects have been reported in some cases. Patients present an increased risk for gonadoblastoma.

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Names in Orphadata languages

12 of 12 languages
LangNameSynonyms
enDistal deletion 9p syndromeDistal monosomy 9p · Monosomy 9pter · Telomeric deletion 9p
frSyndrome de délétion distale 9pDélétion 9pter · Délétion télomérique 9p · Monosomie 9pter · Monosomie distale 9p
deDistale Deletion 9pDistale Monosomie 9p · Monosomie 9pter · Telomere Deletion 9p
esSíndrome de deleción terminal 9pMonosomía 9pter · Monosomía terminal 9p
itSindrome delezione 9p distaleDelezione 9p telomerica · Monosomia 9p distale · Monosomia 9pter
nlDistale deletie 9p-syndroomDistale monosomie 9p · Monosomie 9pter · Telomerische deletie 9p
ptDeleção distal 9pDeleção telomérica 9p · Monossomia 9pter · Monossomia distal 9p
plZespół delecji dystalnej 9pDystalna delecja 9p · Monosomia 9pter
csDistální monozomie 9pDistální delece 9p · Monozomie 9pter · Telomerická delece 9p
ukДистальна делеція 9pДистальна моносомія 9p · Моносомія 9pter · Делеція теломерної ділянки 9p
zh9号染色体短臂远端单倍体9号染色体短臂远端单倍体
trDistal monozomi 9pMonozomi 9pter · Distal delesyon 9p · Telomerik delesyon 9p

Definition in:

2

Cross-references

qualifier = Orphanet mapping relation
SourceCodeQualifierICD relationValidation
ICD-10Q93.5NTBTattributedvalidated
MONDO0015605Evalidated
MeSHC538025Evalidated
UMLSC0265425Evalidated

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

0 direct

Orphanet records no gene directly on this code.

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Prevalence and incidence

2 records
TypeClassValueAreaQualificationValidationSource
Cases/families89 casesWorldwideCase(s)Validated23824832[PMID]_24330994[PMID]
Point prevalence<1 / 1 000 000—WorldwideClass onlyValidatedORPHANET_23824832[PMID]_24330994[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

27 annotations · validated 2016-06-01
HPOTerm (as annotated by Orphanet)Diagnostic
Very frequent (99-80%)
HP:0009738Abnormality of the antihelix
HP:0001263Global developmental delay
HP:0002705High, narrow palate
HP:0000316Hypertelorism
HP:0001252Hypotonia
HP:0001249Intellectual disability
HP:0008551Microtia
HP:0011800Midface retrusion
HP:0000358Posteriorly rotated ears
HP:0000520Proptosis
HP:0000470Short neck
HP:0003196Short nose
HP:0000243Trigonocephaly
HP:0000582Upslanted palpebral fissure
HP:0000431Wide nasal bridge
Frequent (79-30%)
HP:0011039Abnormal helix morphology
HP:0000164Abnormality of the dentition
HP:0009906Aplasia/Hypoplasia of the earlobes
HP:0001156Brachydactyly
HP:0100625Enlarged thorax
HP:0000286Epicanthus
HP:0100790Hernia
HP:0000059Hypoplastic labia majora
HP:0000047Hypospadias
HP:0006610Wide intermamillary distance
Occasional (29-5%)
HP:0030680Abnormal cardiovascular system morphology
HP:0000175Cleft palate

Run the differential on the 12 obligate / very frequent terms

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Sources for this card