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Which syringomyelia is truly associated with multiple sclerosis?
Abstract:
Necrosis of the spinal cord within multiple sclerosis (MS) lesions was suggested as a putative cause of syringomyelic cavity development in MS. A number of evidences suggest however that mechanisms other than necrosis are pathogenetically relevant for cavity formation, possibly depending on the atypical topographical distribution of the demyelinative lesion and on the increased cerebrospinal fluid pressure into the central canal below the compression. Not coincidentally, the hypothesis of post-necrotic and ex-vacuo mechanisms leading to cavitation derives from Japanese studies where MS is characterised by high tissue destructive capability and, besides its rarity, has many differences from the more common Western MS type and similarities with the acute disseminated encephalomyelitis (ADEM). Our opinion is that different MS types (Asian and Western) are accompanied by nonuniform mechanisms of syrinx formation and that the Asian MS type shares common, post-necrotic mechanisms with ADEM.
Insights
Spinal cord necrosis is not the sole cause of syringomyelia in multiple sclerosis (MS). Different MS types may involve distinct cavity formation mechanisms, with Asian MS sharing post-necrotic pathways with acute disseminated encephalomyelitis (ADEM).
Area of Science:
- Neuroscience
- Pathology
Background:
- The pathogenesis of syringomyelic cavity formation in multiple sclerosis (MS) has been debated.
- Necrosis of spinal cord tissue within MS lesions was previously hypothesized as a primary cause.
Discussion:
- Emerging evidence suggests alternative mechanisms, including atypical demyelination patterns and elevated cerebrospinal fluid pressure, contribute to cavitation.
- The 'post-necrotic' and 'ex-vacuo' hypotheses, derived from Japanese MS studies, align with acute disseminated encephalomyelitis (ADEM) and may be specific to certain MS subtypes.
- This challenges the universal applicability of necrosis-centric models for syrinx development in MS.
Key Insights:
- Cavity formation in MS is likely multifactorial, not solely attributable to necrosis.
- Distinct MS subtypes, such as Asian and Western MS, may exhibit unique pathological mechanisms for syrinx development.
- The Asian MS type shares post-necrotic mechanisms with ADEM, suggesting a potential overlap in pathogenesis.
Outlook:
- Further research is needed to elucidate the precise mechanisms driving syrinx formation across diverse MS populations.
- Investigating the role of cerebrospinal fluid dynamics and lesion topography is crucial for understanding cavitation.
- Comparative studies between different MS phenotypes and related neurological conditions like ADEM can refine therapeutic strategies.