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Start free with EleplanSchinzel-Giedion syndrome
ORPHA:798Malformation syndrome
Also called SGS
What it is
A rare multiple congenital anomalies/dysmorphic syndrome characterized by a distinctive facial dysmorphism, hydronephrosis, severe developmental delay, typical skeletal malformations, and genital and cardiac anomalies.
Key facts
- Prevalence
- <1 / 1 000 000
- Age of onset
- Antenatal, Infancy, Neonatal
- Inheritance
- Autosomal dominant, Not applicable
- 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%
7Common30–79%
23- Abnormal heart morphology
- Abnormal helix morphology
- Abnormality of the genital system
- Abnormality of the outer ear
- Broad ribs
- Facial hemangioma
- Failure to thrive in infancy
- Generalized hypertrichosis
- Hydronephrosis
- Hypertelorism
- Hypoplasia of the corpus callosum
- Low-set ears
- Macroglossia
- Narrow forehead
- Proptosis
- Seizure
- Shallow orbits
- Short distal phalanx of finger
- Short neck
- Ventriculomegaly
- Visual impairment
- Wide anterior fontanel
- Wide mouth
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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