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) |
| Cognitive impairment | 90% |
| Generalized hypotonia | 90% |
| Abnormality of hair texture | 75% |
| Feeding difficulties in infancy | 75% |
| High palate | 75% |
| Joint hypermobility | 75% |
| Narrow palate | 75% |
| Nasal speech | 75% |
| Prominent fingertip pads | 75% |
| Long face | 74% |
| Cryptorchidism | 71% |
| Arachnodactyly | 61% |
| Seizures | 55% |
| Abnormality of the cardiac septa | 50% |
| Aplasia/Hypoplasia of the corpus callosum | 50% |
| Blepharophimosis | 50% |
| Broad forehead | 50% |
| Bulbous nose | 50% |
| Coarse facial features | 50% |
| Conspicuously happy disposition | 50% |
| Delayed speech and language development | 50% |
| Displacement of the external urethral meatus | 50% |
| Epicanthus | 50% |
| Everted lower lip vermilion | 50% |
| High forehead | 50% |
| High, narrow palate | 50% |
| Hypermetropia | 50% |
| Hypopigmentation of hair | 50% |
| Macrotia | 50% |
| Microdontia | 50% |
| Neurological speech impairment | 50% |
| Overfolded helix | 50% |
| Pear-shaped nose | 50% |
| Ptosis | 50% |
| Strabismus | 50% |
| Upslanted palpebral fissure | 50% |
| Ventriculomegaly | 50% |
| Broad chin | 42% |
| Hip dislocation | 33% |
| Hip dysplasia | 33% |
| Hypotrophy of the small hand muscles | 33% |
| Kyphosis | 33% |
| Narrow palm | 33% |
| Positional foot deformity | 33% |
| Scoliosis | 33% |
| Abnormality of dental enamel | 7.5% |
| Abnormality of the aortic valve | 7.5% |
| Cataract | 7.5% |
| Dry skin | 7.5% |
| Hypothyroidism | 7.5% |
| Ichthyosis | 7.5% |
| Microcephaly | 7.5% |
| Pectus excavatum | 7.5% |
| Prominent nasal bridge | 7.5% |
| Pyloric stenosis | 7.5% |
| Reduced number of teeth | 7.5% |
| Short stature | 7.5% |
| Small for gestational age | 7.5% |
| Underdeveloped nasal alae | 7.5% |
| Vesicoureteral reflux | 7.5% |
| Wide nasal bridge | 7.5% |
| Aortic dilatation | 5% |
| Hypotelorism | 5% |
| Prominent metopic ridge | 5% |
| Spondylolisthesis | 5% |
| Vertebral fusion | 5% |
| Anteverted ears | - |
| Atria septal defect | - |
| Autosomal dominant inheritance | - |
| Bicuspid aortic valve | - |
| Cleft upper lip | - |
| Contiguous gene syndrome | - |
| Eczema | - |
| Failure to thrive | - |
| Hydronephrosis | - |
| Intellectual disability | - |
| Intrauterine growth retardation | - |
| Open mouth | - |
| Poor speech | - |
| Pulmonic stenosis | - |
| Sacral dimple | - |
| Sporadic | - |
| Variable expressivity | - |
| Ventricular septal defect | - |
| Wide intermamillary distance | - |
| Widely spaced teeth | - |
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.
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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My daughter has been diagnosed with 17q21.31 microdeletion syndrome, and I would like more information on this condition. See answer
