Harel Yoon Syndrome C4310677
A rare genetic disorder affecting multiple body systems, including neurological and endocrine features. Management requires coordinated care from various specialists.
Key facts at a glance
- ICD-10
- G40.909
- ICD-11
- 8A00.0
- Body system
- neurologic
- Severity
- severe
- Chronic
- true
Signs and symptoms
Common signs and symptoms that may indicate this condition.
Warning signs - seek immediate care
Seizures
Generalized symptoms
(neurologic)Significant symptoms that substantially affect daily functioning.
Frequency: Common at all stages
Microcephaly
(neurologic)Ataxia
(neurologic)Optic atrophy
(neurologic)Diagnosis and tests
How this condition is diagnosed and what test results mean.
Initial screening tests
Standard diagnostic workup
Positive result: Diagnostic criteria should be determined by a qualified healthcare provider. [Content pending medical review.]
Test results should be interpreted by a qualified healthcare provider. [Content pending medical review.]
Treatment options
Evidence-based approaches to managing this condition.
First-line treatments
Comprehensive multidisciplinary surveillance
Regular monitoring by specialists including ophthalmology, audiology, cardiology, and developmental pediatrics to track disease progression and intervene early. Serial imaging and functional assessments help guide treatment timing and intensity.
Drug therapy and clinical monitoring
Active treatment with regular monitoring by a healthcare provider is recommended.
Cataract extraction surgery
Surgical removal of congenital cataracts with intraocular lens implantation to restore vision when developmentally appropriate. Early intervention may be necessary to prevent amblyopia.
Additional treatment options
Cognitive-behavioral therapy and developmental support
Psychological interventions addressing intellectual disability through structured behavioral approaches and skill-building programs tailored to individual capabilities and family circumstances.
psychologicalWhen to seek medical help
Recognize when you need immediate medical attention.
See a doctor within 24 hours
Moderate to severe symptoms that may indicate worsening of this condition. Prompt medical evaluation is recommended.
Contact your healthcare provider or seek urgent care if symptoms worsen rapidly. Go to the emergency department for life-threatening symptoms.
Frequently asked questions
Common questions about this topic.
What is Harel Yoon Syndrome C4310677?
Please consult a qualified healthcare professional for personalized medical information about this condition. [Content pending medical review.]
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This content is for general informational and educational purposes only and is not a substitute for professional medical advice, diagnosis, or treatment. Always seek the guidance of a qualified healthcare provider with any questions you have about a medical condition, and never disregard professional medical advice or delay seeking it because of something you read here.
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Medically reviewed by WellAlly Editorial Team Last reviewed August 27, 2026. · Read our editorial policy