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)|
|Aplasia/Hypoplasia of the corpus callosum||100%|
|Duplication of phalanx of hallux||90%|
|Duplication of thumb phalanx||90%|
|Postaxial foot polydactyly||90%|
|Postaxial hand polydactyly||90%|
|Preaxial foot polydactyly||90%|
|Preaxial hand polydactyly||90%|
|Failure to thrive||75%|
|Preauricular skin tag||50%|
|Wide anterior fontanel||50%|
|Cleft upper lip||21%|
|Thin vermilion border||9%|
|Abnormality of the clavicle||7.5%|
|Abnormality of the fontanelles or cranial sutures||7.5%|
|Aplasia/Hypoplasia of the cerebellum||7.5%|
|Congenital diaphragmatic hernia||7.5%|
|Displacement of the external urethral meatus||7.5%|
|Hernia of the abdominal wall||7.5%|
|Posteriorly rotated ears||7.5%|
|Sensorineural hearing impairment||7.5%|
|Hypoplasia of teeth||2%|
|Wide nasal bridge||24/26|
|Abnormality of the pinna||19/23|
|Intracranial cystic lesion||10/27|
|Abnormality of cardiovascular system morphology||5/22|
|Abnormality of the cardiac septa||-|
|Agenesis of corpus callosum||-|
|Autosomal dominant inheritance||-|
|Autosomal recessive inheritance||-|
|Bifid distal phalanx of the thumb||-|
|Clinodactyly of the 5th finger||-|
|Hypopigmentation of the fundus||-|
|Intellectual disability, severe||-|
|Postnatal growth retardation||-|
|Pulmonary valve defects||-|
Making a diagnosis for a genetic or rare disease can often be challenging. Healthcare professionals typically look at a person’s medical history, symptoms, physical exam, and laboratory test results in order to make a diagnosis. The following resources provide information relating to diagnosis and testing for this condition. If you have questions about getting a diagnosis, you should contact a healthcare professional.
Nonprofit support and advocacy groups bring together patients, families, medical professionals, and researchers. These groups often raise awareness, provide support, and develop patient-centered information. Many are the driving force behind research for better treatments and possible cures. They can direct people to research, resources, and services. Many groups also have experts who serve as medical advisors. Visit their website or contact them to learn about the services they offer. Inclusion on this list is not an endorsement by GARD.
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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