raremaprare-disease reference indexOrphadata 2026-06-23 · HPO 2026-09-01
ORPHA:48652

Phelan-McDermid syndrome

Type
Malformation syndrome
Group
Disorder
Inheritance
Not applicable, Unknown
Age of onset
Infancy, Neonatal
Status
active

A rare genetic neurodevelopmental disorder characterized by neonatal hypotonia, global developmental delay, normal to accelerated growth, absent to severely delayed speech, and minor dysmorphic features.

1

Names in Orphadata languages

12 of 12 languages
LangNameSynonyms
enPhelan-McDermid syndrome
frSyndrome de Phelan-McDermid
dePhelan-McDermid-SyndromDeletion 22q13.3 · Monosomie 22q13
esSíndrome de Phelan-McDermid
itSindrome di Phelan-McDermid
nlSyndroom van Phelan-McDermid
ptSíndrome Phelan-McDermid
plMonosomia 22q13Delecja 22q13 · Zespół Phelan i McDermid
csPhelan-McDermidové syndromPhelanové-McDermidové syndrom
ukСиндром Фелана-Макдерміда
zh22q13.3单体Phelan-McDermid综合征
trMonozomi 22q13.322q13.3 delesyon · Phelan-McDermid sendromu

Definition in:

2

Cross-references

qualifier = Orphanet mapping relation
SourceCodeQualifierICD relationValidation
OMIM606232Evalidated
ICD-10Q93.5NTBTattributedvalidated
ICD-11LD44.NYNTBTindexvalidated
MONDO11652Evalidated
MeSHC536801Evalidated
GARD10130Evalidated
MedDRA10082417Evalidated

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):

Children (2):

4

Genes

0 direct · 2 via subtypes

Orphanet records no gene directly on this code.

Recorded by Orphanet on subtypes of this disorder:

GeneSubtypeAssociationStatusHGNCEnsemblOMIMLocusNameSource of validation
SHANK3ORPHA:662172Phelan-McDermid syndrome due to SHANK3 mutationDisease-causing germline mutation(s) (loss of function) inAssessedHGNC:14294ENSG0000025132260623022q13.33SH3 and multiple ankyrin repeat domains 330537371[PMID]_20385823[PMID]
SHANK3ORPHA:662169Phelan-McDermid syndrome due to 22q13.3 deletionRole in the phenotype ofAssessedHGNC:14294ENSG0000025132260623022q13.33SH3 and multiple ankyrin repeat domains 321841781[PMID]
5

Prevalence and incidence

2 records
TypeClassValueAreaQualificationValidationSource
Cases/families200 casesWorldwideCase(s)ValidatedORPHANET
Point prevalenceUnknown—WorldwideClass onlyValidatedORPHANET

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

51 annotations · validated 2016-06-01
HPOTerm (as annotated by Orphanet)Diagnostic
Very frequent (99-80%)
HP:0005616Accelerated skeletal maturation
HP:0003763Bruxism
HP:0000750Delayed speech and language development
HP:0001800Hypoplastic toenails
HP:0007328Impaired pain sensation
HP:0000400Macrotia
HP:0001319Neonatal hypotonia
Frequent (79-30%)
HP:0000729Autistic behavior
HP:0000414Bulbous nose
HP:0000490Deeply set eye
HP:0000268Dolichocephaly
HP:0011968Feeding difficulties
HP:0000293Full cheeks
HP:0000752Hyperactivity
HP:0000966Hypohidrosis
HP:0002721Immunodeficiency
HP:0001176Large hands
HP:0000527Long eyelashes
HP:0000272Malar flattening
HP:0100540Palpebral edema
HP:0000307Pointed chin
HP:0000508Ptosis
HP:0000960Sacral dimple
HP:0002360Sleep abnormality
HP:0000574Thick eyebrow
HP:0000431Wide nasal bridge
Occasional (29-5%)
HP:0001274Agenesis of corpus callosum
HP:0100702Arachnoid cyst
HP:0008278Cerebellar cortical atrophy
HP:0004209Clinodactyly of the 5th finger
HP:0000678Dental crowding
HP:0000689Dental malocclusion
HP:0000286Epicanthus
HP:0002020Gastroesophageal reflux
HP:0001263Global developmental delay
HP:0012167Hair-pulling
HP:0000365Hearing impairment
HP:0000126Hydronephrosis
HP:0000540Hypermetropia
HP:0001249Intellectual disability
HP:0001004Lymphedema
HP:0000256Macrocephaly
HP:0002017Nausea and vomiting
HP:0001513Obesity
HP:0012787Recurrent pyelonephritis
HP:0001581Recurrent skin infections
HP:0000110Renal dysplasia
HP:0001250Seizure
HP:0000486Strabismus
HP:0001537Umbilical hernia
HP:0000076Vesicoureteral reflux

Run the differential on the 7 obligate / very frequent terms

Annotation source: 20301377[PMID]

7

Sources for this card