raremaprare-disease reference indexOrphadata 2026-06-23 · HPO 2026-09-01
ORPHA:369950

Intellectual disability-seizures-macrocephaly-obesity syndrome

Synonyms: Der(8)t(8;12)

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

Intellectual disability-seizures-macrocephaly-obesity syndrome is a rare syndromic obesity due to complex chromosomal rearrangement characterized by development delay and intellectual disability, childhood-onset obesity, seizures, poor coordination and broad-based gait, macrocephaly and mild dysmorphic features (such as narrow palpebral fissures, malar hypoplasia and thin upper lips), eczema, ocular abnormalities and a social personality.

1

Names in Orphadata languages

12 of 12 languages
LangNameSynonyms
enIntellectual disability-seizures-macrocephaly-obesity syndromeDer(8)t(8;12)
frSyndrome de déficience intellectuelle-épilepsie-macrocéphalie-obésité= en
deIntelligenzminderung-Krämpfe-Makrozephalie-Adipositas-Syndrom= en
esSíndrome de discapacidad intelectual-crisis-macrocefalia-obesidad= en
itSindrome da disabilità intellettiva crisi epilettiche, macrocefalia e obesità= en
nlIntellectuele achterstand - insulten - macrocefalie - obesitas-syndroom= en
ptSíndrome de perturbação do desenvolvimento intelectual-convulsões-macrocefalia-obesidade
plZespół niepełnosprawność intelektualna-napady padaczkowe-wielkogłowie-otyłość= en
csSyndrom zahrnující mentální retardaci, záchvaty, makrocefalii a obezitu= en
ukСиндром інтелектуальної недостатності-судом-макроцефалії-ожиріння= en
zh智力障碍-癫痫-大头畸形-肥胖综合征= en
trZihinsel yetersizlik-nöbetler-makrosefali-obezite sendromu= en

Definition in:

2

Cross-references

qualifier = Orphanet mapping relation
SourceCodeQualifierICD relationValidation
ICD-10Q87.8NTBTattributedvalidated
MONDO0018248Evalidated
UMLSC4749455Evalidated

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

0 direct

Orphanet records no gene directly on this code.

5

Prevalence and incidence

2 records
TypeClassValueAreaQualificationValidationSource
Cases/families7 casesWorldwideCase(s)Validated23980137[PMID]
Point prevalence<1 / 1 000 000—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

50 annotations · validated 2016-04-20
HPOTerm (as annotated by Orphanet)Diagnostic
Very frequent (99-80%)
HP:0006482Abnormal dental morphology
HP:0001760Abnormal foot morphology
HP:0012680Abnormality of the pineal gland
HP:0000646Amblyopia
HP:0000483Astigmatism
HP:0002136Broad-based gait
HP:0002019Constipation
HP:0000684Delayed eruption of teeth
HP:0000750Delayed speech and language development
HP:0000494Downslanted palpebral fissures
HP:0000964Eczematoid dermatitis
HP:0000805Enuresis
HP:0000577Exotropia
HP:0001508Failure to thrive
HP:0001290Generalized hypotonia
HP:0001263Global developmental delay
HP:0000365Hearing impairment
HP:0002046Heat intolerance
HP:0001269Hemiparesis
HP:0002705High, narrow palate
HP:0000316Hypertelorism
HP:0001249Intellectual disability
HP:0000256Macrocephaly
HP:0000158Macroglossia
HP:0001634Mitral valve prolapse
HP:0001513Obesity
HP:0000629Periorbital fullness
HP:0000508Ptosis
HP:0000311Round face
HP:0001250Seizure
HP:0000486Strabismus
HP:0100703Tongue thrusting
HP:0001716Wolff-Parkinson-White syndrome
Occasional (29-5%)
HP:0000718Aggressive behavior
HP:0004209Clinodactyly of the 5th finger
HP:0000280Coarse facial features
HP:0000722Compulsive behaviors
HP:0000444Convex nasal ridge
HP:0000286Epicanthus
HP:0002079Hypoplasia of the corpus callosum
HP:0003186Inverted nipples
HP:0002003Large forehead
HP:0000347Micrognathia
HP:0000160Narrow mouth
HP:0001763Pes planus
HP:0000358Posteriorly rotated ears
HP:0001051Seborrheic dermatitis
HP:0000574Thick eyebrow
HP:0000179Thick lower lip vermilion
HP:0011246Underdeveloped superior crus of antihelix

Run the differential on the 12 obligate / very frequent terms

Annotation source: 23980137[PMID]

7

Sources for this card