Huntington Disease Like Syndrome Due To C9orf72 Expansions C5190586
A rare genetic condition where expansion of the C9orf72 gene can cause symptoms resembling Huntington disease, including movement disorders and thinking changes. Management focuses on symptom relief and support.
Key facts at a glance
- ICD-10
- G43.909
- 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
Amyotrophic lateral sclerosis features
Psychotic symptoms
Behavioral variant frontotemporal dementia
(neurologic)Generalized symptoms
(neurologic)Significant symptoms that substantially affect daily functioning.
Frequency: Common at all stages
Movement abnormalities
(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
FTD-spectrum behavioral management
Pharmacological management of behavioral symptoms including agitation, compulsivity, or apathy using targeted agents such as SSRIs or atypical antipsychotics when non-pharmacological approaches are insufficient.
Targeted drug therapy with dose adjustment
Active treatment with regular monitoring by a healthcare provider is recommended.
Behavioral intervention program
Structured behavioral management strategies including environmental modifications, caregiver training in de-escalation techniques, and structured daily routines to manage disinhibition and repetitive behaviors.
Additional treatment options
Cognitive and behavioral tracking
Regular neuropsychological assessments to monitor cognitive decline, behavioral changes, and emergence of psychiatric symptoms. Helps guide treatment decisions and care planning.
monitoringStructure and routine support
Implementation of predictable daily schedules, simplified communication strategies, and supervised activities to reduce confusion and anxiety. Environmental structuring helps maintain function longer.
lifestyleSupportive care services
Integration of support services including social work, palliative care consultation, and community resources for patients and families navigating this complex condition. Addresses quality of life and advance care planning.
complementaryWhen 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 Huntington Disease Like Syndrome Due To C9orf72 Expansions C5190586?
Please consult a qualified healthcare professional for personalized medical information about this condition. [Content pending medical review.]
generalMedication Comparisons
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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.
If you think you may have a medical emergency, call your local emergency number or go to the nearest emergency department immediately.
Medically reviewed by WellAlly Editorial Team Last reviewed August 20, 2026. · Read our editorial policy