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Published on: April 14, 2014
Inborn errors and demyelination: MRI and the diagnosis of white matter disease
1Hospital for Sick Children, London, UK.
Abstract:
The progress and extent of myelination can be assessed using magnetic resonance imaging (MRI). Myelination is delayed or diminished in several inherited metabolic abnormalities presenting in early life. Only minimal myelination of the CNS occurs in Pelizaeus-Merzbacher disease. Dysmyelination tends to produce fairly symmetrical lesions affecting white matter. In many mitochondrial enzyme and some lysosomal defects, the grey matter is also involved. The appearances and in particular the distribution on MRI and/or CT are characteristic in some conditions and the diagnosis is limited in others. Demyelination due to inflammatory disorders typically causes multifocal white matter lesions, recurrent in multiple sclerosis, monophasic in acute disseminated encephalomyelitis, extending in progressive multifocal leukoencephalopathy and classically involving the pons or corpus callosum in myelinolysis. Hypoxic ischaemic lesions may be metabolically induced and simulate primary demyelinating disorders. Mitochondrial enzyme defects in particular may present with stroke-like appearances. In many of these conditions, diagnosis is biochemical, but imaging has a significant role in suggesting the diagnosis, and documenting progression, response to therapy or complications.
Insights
Magnetic resonance imaging (MRI) assesses myelination, crucial for diagnosing inherited metabolic disorders affecting the central nervous system (CNS). Imaging aids in identifying dysmyelination and demyelination patterns, guiding diagnosis and monitoring treatment response.
Area of Science:
- Neuroimaging
- Neurology
- Biochemistry
Background:
- Myelination assessment is vital for diagnosing early-life neurological disorders.
- Inherited metabolic abnormalities often present with delayed or diminished myelination.
- Magnetic resonance imaging (MRI) and computed tomography (CT) are key diagnostic tools.
Purpose of the Study:
- To review the role of neuroimaging in diagnosing and monitoring conditions affecting myelination.
- To differentiate between various white matter disorders based on imaging characteristics.
- To highlight the interplay between biochemical diagnosis and imaging findings.
Main Methods:
- Review of neuroimaging findings (MRI/CT) in various demyelinating and dysmyelinating disorders.
- Correlation of imaging patterns with specific inherited metabolic abnormalities, inflammatory conditions, and hypoxic-ischemic insults.
- Discussion of diagnostic limitations and the role of imaging in disease progression and therapeutic monitoring.
Main Results:
- Pelizaeus-Merzbacher disease shows minimal central nervous system (CNS) myelination.
- Dysmyelination typically presents as symmetrical white matter lesions.
- Inflammatory demyelination exhibits diverse patterns (e.g., multifocal in multiple sclerosis, pontine in myelinolysis).
- Mitochondrial and lysosomal defects can involve grey matter and present with stroke-like appearances.
- Imaging findings can be characteristic, suggestive, or limited depending on the condition.
Conclusions:
- Neuroimaging plays a significant role in suggesting diagnoses for myelination disorders.
- Imaging is essential for documenting disease progression and response to therapy.
- While biochemical tests are often definitive, imaging provides critical diagnostic support and monitoring capabilities.
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