I67.850 Cerebral autosomal dominant arteriopathy with subcortical infarcts and leukoencephalopathy

Name of the Condition

• Cerebral autosomal dominant arteriopathy with subcortical infarcts and leukoencephalopathy

Summary

Cerebral autosomal dominant arteriopathy with subcortical infarcts and leukoencephalopathy (CADASIL) is a hereditary condition affecting small blood vessels in the brain. It leads to progressive damage, including subcortical infarcts and white matter changes, resulting in neurological symptoms. The condition typically presents in mid-adulthood and may worsen over time, impacting motor function, cognition, and mood.

Causes

CADASIL is caused by mutations in the NOTCH3 gene, which affects the structure and function of small cerebral arteries. These genetic changes lead to thickening of vessel walls, reduced blood flow, and subsequent brain tissue damage. The condition is inherited in an autosomal dominant pattern, meaning a single copy of the altered gene can cause the disorder.

Risk Factors

• Family history of CADASIL or similar neurological disorders.
• Presence of NOTCH3 gene mutations.
• Middle age (typically onset between 30–50 years).
• No significant gender or ethnic predisposition beyond genetic inheritance.

Symptoms

• Recurrent headaches, often migrainous in nature.
• Transient ischemic attacks (TIAs) or stroke-like episodes.
• Progressive cognitive decline, including memory loss and executive dysfunction.
• Mood disturbances, such as depression or apathy.
• Gait abnormalities, weakness, or sensory changes.
• Seizures in some cases.

Diagnosis

Clinical evaluation focuses on neurological symptoms, family history, and genetic testing for NOTCH3 mutations. Imaging studies, such as MRI, reveal characteristic white matter hyperintensities and subcortical infarcts. Skin biopsy may show granular osmiophilic material (GOM) deposits, supporting the diagnosis. Exclusion of other vascular or genetic conditions is essential.

Treatment Options

Management is supportive, as no cure exists. Blood pressure control and antiplatelet therapy (e.g., aspirin) may reduce stroke risk. Symptomatic treatment addresses headaches, mood disorders, or seizures. Physical and occupational therapy helps maintain function. Genetic counseling is recommended for affected families.

Prognosis and Follow-Up

Prognosis varies, with gradual decline in function over decades. Regular neurological assessments monitor cognitive and motor changes. Follow-up imaging may track disease progression. Early intervention can mitigate complications, but long-term disability is common.

Complications

• Progressive cognitive impairment, potentially leading to dementia.
• Recurrent strokes or TIAs.
• Mood disorders, including depression or anxiety.
• Gait instability and increased fall risk.
• Seizure disorders in a subset of patients.

Lifestyle & Prevention

• Maintain blood pressure within target ranges.
• Avoid smoking and excessive alcohol use.
• Engage in regular physical activity to support vascular health.
• Follow a balanced diet to reduce cardiovascular risk factors.
• Genetic testing and counseling for at-risk family members.

When to Seek Professional Help

Seek immediate care for sudden neurological symptoms (e.g., weakness, speech changes, or vision loss), which may indicate stroke. Consult a neurologist for persistent headaches, cognitive decline, or mood changes. Regular follow-ups are advised for those with a family history of CADASIL.

Tips for Medical Coders

Document the presence of NOTCH3 mutations or genetic testing results when available, as these support the diagnosis. Include details of imaging findings (e.g., MRI evidence of subcortical infarcts or leukoencephalopathy) and clinical symptoms. Ensure coding aligns with the specific ICD-10-CM code I67.850 for accurate classification.