How is Cadasil (Cerebral Autosomal Dominant Arteriopathy With Sub-Cortical Infarcts And Leukoencephalopathy) diagnosed?

TL;DR: CADASIL (Cerebral Autosomal Dominant Arteriopathy with Sub-cortical Infarcts and Leukoencephalopathy) is primarily diagnosed through genetic testing that identifies mutations in the NOTCH3 gene. While brain MRI is a critical first step to identify characteristic white matter changes, a definitive diagnosis requires confirming the presence of these specific pathogenic variants.

How is CADASIL diagnosed?

The diagnostic process for CADASIL often begins when a patient presents with recurrent strokes, cognitive decline, or migraines with aura. Because CADASIL symptoms can mimic common vascular issues, the diagnostic odyssey can be long and frustrating. Clinicians typically follow a structured approach:

• Clinical Evaluation: Assessment of neurological history and family pedigree.


• Neuroimaging (MRI): Brain MRIs often show characteristic hyperintensities in the anterior temporal lobes and external capsule.


• Genetic Testing: The gold standard for confirming CADASIL is molecular genetic testing to detect mutations in the NOTCH3 gene.


• Skin Biopsy: In rare cases where genetic testing is inconclusive, a skin biopsy can be performed to identify granular osmiophilic material (GOM) deposits around vascular smooth muscle cells.

Which specialists are involved in a CADASIL diagnosis?

Due to the complexity of CADASIL, a multidisciplinary approach is essential. Patients are most effectively managed by a neurologist, specifically a vascular neurologist or a specialist in neurogenetics. If you suspect you have CADASIL but are receiving conflicting information, seeking a second opinion from a major academic medical center or a specialist familiar with rare genetic vascular disorders is vital to ending the diagnostic uncertainty.

What conditions are commonly confused with CADASIL?

Because CADASIL presents with white matter lesions and cognitive changes, it is frequently misdiagnosed as Multiple Sclerosis, chronic small vessel disease, or late-onset migraines. It is important to rule out other hereditary leukoencephalopathies, which is why genetic counseling is a standard part of the diagnostic process.

Next steps

• Consult a neurologist specializing in neurogenetics or stroke care.


• Request a referral for NOTCH3 genetic testing to confirm the diagnosis.


• Join the DiseaseMaps community of 57 members to share experiences and find support.


• Keep a detailed log of your symptoms and family medical history to assist your specialists.

Medical disclaimer: This content is for informational purposes only and does not constitute medical advice; always consult with a qualified healthcare professional regarding your specific health condition.

References

• NIH Genetic and Rare Diseases Information Center (GARD): CADASIL


• Orphanet: Cerebral autosomal dominant arteriopathy with subcortical infarcts and leukoencephalopathy


• OMIM (Online Mendelian Inheritance in Man): NOTCH3 Gene Entry


• The CADASIL Foundation: Patient Resources and Clinical Information