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Start free with EleplanIntellectual disability-seizures-macrocephaly-obesity syndrome
ORPHA:369950Disease
Also called Der(8)t(8;12)
What it is
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.
Key facts
- Prevalence
- <1 / 1 000 000
- Age of onset
- Infancy, Neonatal
- Inheritance
- Not applicable, Unknown
- Classified as
- Disease
Prevalence figures describe populations, not individuals, and are often estimates from a single study. Where the figure is an incidence or a birth prevalence, it says so.
Signs and symptoms
Very common80–99%
33- Abnormal dental morphology
- Abnormal foot morphology
- Abnormality of the pineal gland
- Amblyopia
- Astigmatism
- Broad-based gait
- Constipation
- Delayed eruption of teeth
- Delayed speech and language development
- Downslanted palpebral fissures
- Eczematoid dermatitis
- Enuresis
- Exotropia
- Failure to thrive
- Generalized hypotonia
- Global developmental delay
- Hearing impairment
- Heat intolerance
- Hemiparesis
- High, narrow palate
- Hypertelorism
- Intellectual disability
- Macrocephaly
- Macroglossia
- Mitral valve prolapse
- Obesity
- Periorbital fullness
- Ptosis
- Round face
- Seizure
- Strabismus
- Tongue thrusting
- Wolff-Parkinson-White syndrome
These ranges are how often a sign appears across everyone diagnosed, not a prediction for one person — most people have some of these and not others. Orphanet also records findings that are specifically absent in this disease; those are in the data but not listed here.
ICD-10 codes
ICD-10 has no distinct code for most rare diseases, so many are filed under the nearest available one. A shared code identifies the group, not this disease — the ORPHAcode above is what identifies it.
Related health topics
Reached through the ICD-10 categories this disease is filed under, so these describe the broader group rather than this disease specifically.
Cross-references
Orphadata Science: Free access data from Orphanet. © INSERM 1999. Data version 2026-06-23. Available under CC BY 4.0. This is a reference, not medical advice.
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