Caring for someone with this diagnosis? Eleplan keeps diagnoses, medications, documents and every specialist in one plan.
Start free with EleplanDistal Xq28 microduplication syndrome
ORPHA:293939Malformation syndrome
Also called Distal dup(X)q(28) · Distal trisomy Xq28 · Int22h1/Int22h2 mediated-Xq28 microduplication syndrome
What it is
A rare syndromic X-linked intellectual disability characterized by cognitive impairment, behavioral and psychiatric problems, obesity, recurrent infections, atopic diseases, and distinctive facial features in males. Females are clinically asymptomatic or mildly affected, presenting mild learning difficulties and facial dysmorphism.
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%
38- Abnormality of central sensory function
- Absent antihelix
- Aggressive behavior
- Anxiety
- Aplasia/Hypoplasia of the eyebrow
- Arthralgia
- Asthma
- Attention deficit hyperactivity disorder
- Autistic behavior
- Broad nasal tip
- Deeply set eye
- Delayed fine motor development
- Delayed speech and language development
- Dental crowding
- Depression
- Epistaxis
- Generalized muscle weakness
- Global developmental delay
- High forehead
- High palate
- Hypoplasia of the maxilla
- Impulsivity
- Intellectual disability
- Metatarsus adductus
- Microcephaly
- Microtia
- Neonatal hyperbilirubinemia
- Open mouth
- Patent ductus arteriosus
- Patent foramen ovale
- Recurrent upper respiratory tract infections
- Reduced eye contact
- Short lingual frenulum
- Short stature
- Stereotypical body rocking
- Thick lower lip vermilion
- Tip-toe gait
- Upper eyelid edema
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.
Powered by Eleplan
A rare diagnosis is just the start. Eleplan keeps the whole care plan in one place.
Diagnoses, medications, documents, appointments, and the whole care team — organized and always in sync, so you are not retelling the same story to every new specialist. With Ellie, your AI care assistant, on top of it. Free to start.