This table lists symptoms that people with this disease may have. For most diseases, symptoms will vary from person to person. People with the same disease may not have all the symptoms listed. This information comes from a database called the Human Phenotype Ontology (HPO) . The HPO collects information on symptoms that have been described in medical resources. The HPO is updated regularly. Use the HPO ID to access more in-depth information about a symptom.
|Medical Terms||Other Names||
|80%-99% of people have these symptoms|
|Aplasia/Hypoplasia of the cerebellum||
Absent/underdeveloped cerebellum[ more ]
Uneven or disproportionate growth of one body part compared to another
Collection of dilated blood vessels that forms mass
Knee hyperextension[ more ]
Mental retardation, nonspecific
Mental-retardation[ more ]
Abnormally small eyeball
Low or weak muscle tone
Prominent back of the skull
Prominent posterior skull[ more ]
|Reduced tendon reflexes||0001315|
Corners of eye widely separated
|Vertebral segmentation defect||0003422|
|30%-79% of people have these symptoms|
|Abnormality of vision||
Abnormality of sight
Vision issue[ more ]
Asymmetry of face
Unsymmetrical face[ more ]
Flat head syndrome
Flattening of skull
Rhomboid shaped skull[ more ]
Cavity within brain
|5%-29% of people have these symptoms|
|Aplasia/Hypoplasia of the
Abnormal deposits of calcium in the brain
Retarded growth[ more ]
High urine phosphate levels
Eye muscle paralysis
Early onset of puberty
Early puberty[ more ]
|Percent of people who have these symptoms is not available through HPO|
|Abnormality of dental color||
Abnormality of tooth color
Abnormality of tooth shade[ more ]
|Abnormality of dental morphology||
Abnormality of dental shape
Abnormally shaped teeth
Deformity of teeth
Misshapened teeth[ more ]
|Abnormality of finger||
Abnormalities of the fingers
|Abnormality of toe||
Abnormalities of the toes
|Coarctation of aorta||
Narrowing of aorta
Narrowing of the aorta[ more ]
|Hypopigmentation of the skin||
Patchy lightened skin
|Linear nevus sebaceous||0010817|
Increased fracture rate
Multiple spontaneous fractures
Varying degree of multiple fractures[ more ]
Decreased body height
Small stature[ more ]
No previous family history
If you need medical advice, you can look for doctors or other healthcare professionals who have experience with this disease. You may find these specialists through advocacy organizations, clinical trials, or articles published in medical journals. You may also want to contact a university or tertiary medical center in your area, because these centers tend to see more complex cases and have the latest technology and treatments.
If you can’t find a specialist in your local area, try contacting national or international specialists. They may be able to refer you to someone they know through conferences or research efforts. Some specialists may be willing to consult with you or your local doctors over the phone or by email if you can't travel to them for care.
You can find more tips in our guide, How to Find a Disease Specialist. We also encourage you to explore the rest of this page to find resources that can help you find specialists.
Related diseases are conditions that have similar signs and symptoms. A health care provider may consider these conditions in the table below when making a diagnosis. Please note that the table may not include all the possible conditions related to this disease.
Conditions with similar signs and symptoms from Orphanet
Differential diagnosis includes cutaneous-skeletal hypophosphatemia syndrome, nevus comedonicus syndrome, Becker nevus syndrome, phakomatosis pigmentokeratotica, CHILD syndrome, the spectrum of PIK3CA-related overgrowth syndrome, SOLAMEN (segmental outgrowth-lipomatosis-arteriovenous malformation-epidermal nevus syndrome), and CLOVES syndrome.
Visit the Orphanet disease page for more information.
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.
Support and advocacy groups can help you connect with other patients and families, and they can provide valuable services. Many develop patient-centered information and are the driving force behind research for better treatments and possible cures. They can direct you to research, resources, and services. Many organizations also have experts who serve as medical advisors or provide lists of doctors/clinics. Visit the group’s website or contact them to learn about the services they offer. Inclusion on this list is not an endorsement by GARD.
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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At what age does a child get symptoms of sebaceous nevus? See answer
I was wondering if you could provide me with more information on linear sebaceous nevus syndrome. My son was diagnosed with this and I am having a real hard time finding information on it. See answer