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Start free with EleplanIntellectual disability-obesity-brain malformations-facial dysmorphism syndrome
ORPHA:352530Disease
Also called Autosomal recessive intellectual disability due to TRAPPC9 deficiency
What it is
Intellectual disability-obesity-brain malformations-facial dysmorphism syndrome is a rare, syndromic intellectual disability primarily characterized by moderate to severe intellectual disability, true-to-relative microcephaly and brain abnormalities including a thin corpus callosum, cerebellar hypoplasia, cerebral white matter hypoplasia and multi-focal hyperintensity of cerebral white matter on MRI. Obesity and distinctive craniofacial dysmorphism (including brachycephaly, round face, straight eyebrows, synophrys, hypertelorism, epicanthus, wide and depressed nasal bridge, protruding ears with uplifted lobe, downslanting corners of the mouth) are additional features.
Key facts
- Prevalence
- <1 / 1 000 000
- Age of onset
- Infancy, Neonatal
- Inheritance
- Autosomal recessive
- 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%
26- Abnormal facial shape
- Abnormality of brain morphology
- Brachycephaly
- Cerebellar hypoplasia
- Cerebral cortical atrophy
- Clinodactyly of the 5th finger
- Congenital hypothyroidism
- Congenital stationary night blindness
- Downturned corners of mouth
- Global developmental delay
- Hypertelorism
- Hypoplasia of the corpus callosum
- Hypotonia
- Intellectual disability, severe
- Large fleshy ears
- Malignant hyperthermia
- Microcephaly
- Multifocal cerebral white matter abnormalities
- Narrow forehead
- Obesity
- Round face
- Synophrys
- Tapered finger
- Thin upper lip vermilion
- Underdeveloped supraorbital ridges
- Wide nasal bridge
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.
Gene
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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