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Start free with EleplanX-linked intellectual disability, Van Esch type
ORPHA:163976Malformation syndrome
What it is
A rare, genetic, syndromic intellectual disability characterized by developmental delay, mild to moderate intellectual disability, low birth weight, moderate to severe short stature, microcephaly and variable hypergonadotropic hypogonadism. Mild facial dismorphism include upslanted palpebral fissures and prominent nasal bridge.
Key facts
- Prevalence
- <1 / 1 000 000
- Age of onset
- Infancy, Neonatal
- Inheritance
- X-linked recessive
- Classified as
- Malformation syndrome
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%
17- Absence of secondary sex characteristics
- Attention deficit hyperactivity disorder
- Cryptorchidism
- Decreased testicular size
- Delayed skeletal maturation
- Failure to thrive
- Hypergonadotropic hypogonadism
- Intellectual disability, mild
- Intrauterine growth retardation
- Male hypogonadism
- Microcephaly
- Microtia
- Reduced social responsiveness
- Retractile testis
- Retrognathia
- Short stature
- Type II diabetes mellitus
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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