raremaprare-disease reference indexOrphadata 2026-06-23 · HPO 2026-09-01
ORPHA:920

Ablepharon macrostomia syndrome

Synonyms: AMS

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

A rare congenital malformation characterized by absent or severely underdeveloped eyelids (ablepharon), a lateral enlargement of the mouth (macrostomia), malformed external ears, and redundant skin folds.

1

Names in Orphadata languages

12 of 12 languages
LangNameSynonyms
enAblepharon macrostomia syndromeAMS
frSyndrome d'ablépharie-macrostomie= en
deAblepharon-Makrostomie-Syndrom= en
esSíndrome de abléfaron-macrostomía
itSindrome ablefaron-macrostomia= en
nlAblefaron - macrostomie-syndroomAMS · Ablepharon - macrostomie-syndroom
ptSíndrome de abléfaro-macrostomiaMAS
plZespół braku/niedorozwoju powiek i makrostomii= en
csSyndrom zahrnující ablefarii a makrostomiiSyndrom zahrnující ablefaron a makrostomii · Syndrom zahrnující ablepharon a makrostomii
ukСиндром аблефарона макростомії
zh无睑-巨口综合征
trAblefaron makrostomi sendromu

Definition in:

2

Cross-references

qualifier = Orphanet mapping relation
SourceCodeQualifierICD relationValidation
OMIM200110Evalidated
ICD-10Q87.0NTBTattributedvalidated
ICD-11LD2F.1YNTBTindexvalidated
MONDO0008693Evalidated
MeSHC535557Evalidated
UMLSC1860224Evalidated
GARD3Evalidated
MedDRA10083860Evalidated

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 (4):

No children.

4

Genes

1 direct
GeneAssociationStatusHGNCEnsemblOMIMLocusNameSource of validation
TWIST2Disease-causing germline mutation(s) inAssessedHGNC:20670ENSG000002336086075562q37.3twist family bHLH transcription factor 226119818[PMID]
5

Prevalence and incidence

2 records
TypeClassValueAreaQualificationValidationSource
Cases/families21 casesWorldwideCase(s)Validated39792429[PMID]
Point prevalence<1 / 1 000 000—WorldwideClass onlyValidatedORPHANET_27196381[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.

6

HPO phenotypes

39 annotations · validated 2016-06-01
HPOTerm (as annotated by Orphanet)Diagnostic
Very frequent (99-80%)
HP:0011224Ablepharon
HP:0002223Absent eyebrow
HP:0000561Absent eyelashes
HP:0000750Delayed speech and language development
HP:0002213Fine hair
HP:0010669Hypoplasia of the zygomatic bone
HP:0008551Microtia
HP:0001582Redundant skin
HP:0008070Sparse hair
HP:0000430Underdeveloped nasal alae
HP:0000154Wide mouth
Frequent (79-30%)
HP:0000055Abnormality of female external genitalia
HP:0000062Ambiguous genitalia
HP:0000463Anteverted nares
HP:0006709Aplasia/Hypoplasia of the nipples
HP:0003187Breast hypoplasia
HP:0100490Camptodactyly of finger
HP:0007957Corneal opacity
HP:0001126Cryptophthalmos
HP:0000958Dry skin
HP:0007392Excessive wrinkled skin
HP:0001263Global developmental delay
HP:0000365Hearing impairment
HP:0008736Hypoplasia of penis
HP:0000327Hypoplasia of the maxilla
HP:0000691Microdontia
HP:0000545Myopia
HP:0000963Thin skin
HP:0001537Umbilical hernia
HP:0000505Visual impairment
Occasional (29-5%)
HP:0010720Abnormal hair pattern
HP:0001000Abnormality of skin pigmentation
HP:0000413Atresia of the external auditory canal
HP:0200020Corneal erosion
HP:0005280Depressed nasal bridge
HP:0001510Growth delay
HP:0001539Omphalocele
HP:0000233Thin vermilion border
HP:0001770Toe syndactyly

Run the differential on the 11 obligate / very frequent terms

7

Sources for this card