What urine NAA level is diagnostic of Canavan disease?

Urinary N-acetylaspartate >50 mmol/mol creatinine (normal <50) is characteristic; plasma NAA is also elevated; diagnosis confirmed by ASPA gene sequencing or absent aspartoacylase activity in fibroblasts.

What MRI pattern is seen in Canavan disease?

Diffuse symmetric white matter T2 hyperintensity with subcortical U-fiber involvement is characteristic; cerebellum and brainstem are also affected; magnetic resonance spectroscopy shows dramatically elevated NAA peak.

What is the clinical presentation and prognosis of Canavan disease?

Macrocephaly at 3-6 months, severe hypotonia, failure to meet motor milestones, visual failure, seizures, and early death (median age 3-5 years in severe form); mild adult-onset form has been described.

What gene therapy approaches are in development for Canavan?

AAV gene therapy delivering ASPA to the brain is in clinical trials; early results show reduced NAA, improved myelination on MRI, and slowed clinical deterioration; long-term outcomes being evaluated.

What is the genetic epidemiology of Canavan disease?

Ashkenazi Jewish population has carrier frequency ~1 in 40; common mutations E285A and Y231X account for ~99% of Ashkenazi cases; ACMG recommends Ashkenazi Jewish carrier screening.

Canavan Disease Developmental Severity Assessment

Evaluates Canavan disease (aspartoacylase deficiency) severity using urine N-acetylaspartate levels, developmental milestone assessment, MRI white matter signal score, and macrocephaly percentile.

Use the full interactive calculator below, or

Related Calculators

Metabolic Syndrome Risk

Medical Calculators

X-ALD Brain Score

Medical Calculators

PDHc Deficiency

Medical Calculators

Canavan Disease Developmental Severity Assessment

Related Calculators

Frequently Asked Questions

What urine NAA level is diagnostic of Canavan disease?

What MRI pattern is seen in Canavan disease?

What is the clinical presentation and prognosis of Canavan disease?

What gene therapy approaches are in development for Canavan?

What is the genetic epidemiology of Canavan disease?