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Start free with EleplanMowat-Wilson syndrome
ORPHA:2152Malformation syndrome
Also called Hirschsprung disease-intellectual disability syndrome
What it is
A rare multiple congenital anomaly syndrome characterized by a distinct facial phenotype, intellectual disability, epilepsy, Hirschsprung disease (HSCR) and variable congenital malformations.
Key facts
- Prevalence
- 1-9 / 100 000 (at birth, Europe)
- Age of onset
- Antenatal, Neonatal
- Inheritance
- Autosomal dominant
- 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
Common30–79%
61- Abnormal cardiac septum morphology
- Abnormal heart morphology
- Abnormal repetitive mannerisms
- Aganglionic megacolon
- Agenesis of corpus callosum
- Bowel incontinence
- Broad-based gait
- Broad columella
- Broad eyebrow
- Broad hallux
- Camptodactyly
- Cryptorchidism
- Decreased body weight
- Deeply set eye
- Delayed ability to walk
- Delayed fine motor development
- Delayed skeletal maturation
- Depressed nasal tip
- EEG with generalized slow activity
- Everted lower lip vermilion
- Flexion contracture
- Genu valgum
- Growth delay
- Hallux valgus
- Happy demeanor
- Horizontal eyebrow
- Hypertelorism
- Hypoplasia of the corpus callosum
- Hypospadias
- Impaired pain sensation
- Intellectual disability, moderate
- Intellectual disability, severe
- Long face
- Long toe
- Low hanging columella
- Mandibular prognathia
- Microcephaly
- Morphological central nervous system abnormality
- Motor aphasia
- Neurodevelopmental delay
- Open mouth
- Patent ductus arteriosus
- Pectus carinatum
- Pectus excavatum
- Pes planus
- Pointed chin
- Posteriorly rotated ears
- Prominent nasal tip
- Recurrent otitis media
- Scoliosis
- Seizure
- Short stature
- Sleep abnormality
- Strabismus
- Syndactyly
- Telecanthus
- Thick lower lip vermilion
- Ulnar deviation of the hand
- Uplifted earlobe
- Urinary incontinence
- Wide nasal bridge
Sometimes5–29%
62- Abnormal cerebral white matter morphology
- Abnormal dental morphology
- Abnormal hippocampus morphology
- Abnormality of the eye
- Abnormality of the kidney
- Adducted thumb
- Agenesis of cerebellar vermis
- Anxiety
and 54 more in this range
Rare1–4%
17- Anterior plagiocephaly
- Bifid scrotum
- Bifid uvula
- Chordee
- Cleft hard palate
- Cleft palate
- Dysphagia
- Hydrocele testis
and 9 more in this range
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.
Genes reported in subtypes
Orphanet records this gene on 2 more specific entries under this disorder, not on this entry itself:
A well-studied disease is usually split into subtypes, and the gene is curated on whichever one the evidence belongs to. Open a subtype to see which gene goes with it.
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.
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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