The Human Phenotype Ontology (HPO) provides the following list of features that have been reported in people with this condition. Much of the information in the HPO comes from Orphanet, a European rare disease database. If available, the list includes a rough estimate of how common a feature is (its frequency). Frequencies are based on a specific study and may not be representative of all studies. You can use the MedlinePlus Medical Dictionary for definitions of the terms below.
| Signs and Symptoms | Approximate number of patients (when available) |
| Abnormal hair quantity | 90% |
| Abnormality of calvarial morphology | 90% |
| Aplasia/Hypoplasia of the cerebellum | 90% |
| Cognitive impairment | 90% |
| Hydrocephalus | 90% |
| Impaired pain sensation | 90% |
| Incoordination | 90% |
| Low-set, posteriorly rotated ears | 90% |
| Malar flattening | 90% |
| Opacification of the corneal stroma | 90% |
| Short stature | 90% |
| Abnormality of the toenails | 50% |
| Anteverted nares | 50% |
| Hypertelorism | 50% |
| Mask-like facies | 50% |
| Telecanthus | 50% |
| Thin vermilion border | 50% |
| Visual impairment | 50% |
| Agenesis of cerebellar vermis | - |
| Alopecia | - |
| Ataxia | - |
| Bipolar affective disorder | - |
| Brachycephaly | - |
| Cerebellar vermis hypoplasia | - |
| Craniosynostosis | - |
| Fusion of the cerebellar hemispheres | - |
| Growth hormone deficiency | - |
| High palate | - |
| Hyperactivity | - |
| Hyperreflexia | - |
| Hypertonia | - |
| Low-set ears | - |
| Midface retrusion | - |
| Muscular hypotonia | - |
| Posteriorly rotated ears | - |
| Seizures | - |
| Self-injurious behavior | - |
| Short nose | - |
| Skull asymmetry | - |
| Smooth philtrum | - |
| Sporadic | - |
| Strabismus | - |
| Turricephaly | - |
| Wide anterior fontanel | - |
| Wormian bones | - |
The resources below provide information about treatment options for this condition. If you have questions about which treatment is right for you, talk to your healthcare professional.
Research helps us better understand diseases and can lead to advances in diagnosis and treatment. This section provides resources to help you learn about medical research and ways to get involved.
Living with a genetic or rare disease can impact the daily lives of patients and families. These resources can help families navigate various aspects of living with a rare disease.
These resources provide more information about this condition or associated symptoms. The in-depth resources contain medical and scientific language that may be hard to understand. You may want to review these resources with a medical professional.
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