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|
|Generalized myoclonic seizure||0002123|
|Generalized myoclonic-atonic seizure||0011170|
|30%-79% of people have these symptoms|
|Abnormal brain FDG positron emission tomography||0012658|
Loss of developmental milestones
Mental deterioration in childhood[ more ]
Difficulty articulating speech
|EEG with abnormally slow frequencies||0011203|
Cognitive decline, progressive
Progressive cognitive decline[ more ]
Repeated seizures without recovery between them
|5%-29% of people have these symptoms|
Aggressiveness[ more ]
|Febrile seizure (within the age range of 3 months to 6 years)||
Fever induced seizures
|Generalized non-motor (absence) seizure||
Brief seizures with staring spells
|Photosensitive tonic-clonic seizure||0007207|
|Percent of people who have these symptoms is not available through HPO|
Mental retardation, nonspecific
Mental-retardation[ more ]
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.
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 diagnoses include Lennox-Gastaut syndrome, Dravet syndrome, Benign Myoclonic Epilepsy of Infancy (see these terms) and structural brain lesions.
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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