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Parainfectious myelitis: three distinct clinico-imagiological patterns with prognostic implications
S Pradhan1, R K Gupta, D Ghosh
1Department of Neurology, Sanjay Gandhi Postgraduate Institute of Medical Sciences, Lucknow, India.
Abstract:
Seventeen parainfectious myelitis patients were studied for site, extent and severity of lesions. Three patterns were observed each having distinct clinical, electrophysiological and MRI features: 1) focal segmental myelitis--focal cord lesion with long tract signs and good prognosis; 2) ascending myelitis--continuous lesion from conus to mid-cord with upper and lower motor neuron signs (not necessarily spinal shock), dysautonomia and poor outcome; 3) disseminated myelitis--discrete lesions scattered throughout the cord with subtle signs in spinal segmental distribution, above and below the transverse level and moderate outcome. Severe autonomic dysfunction, denervation of paraspinal muscles, "dense" lesion on imaging and often (but not always) the absent somatosensory evoked potentials carried poor outcome. In conclusion "parainfectious myelitis" is a better term to describe transverse myelitis, as the lesion extends to a large vertical extent. Further classification into 3 subgroups may improve understanding of anatomical and physiological dysfunction and prediction of outcome.
Insights
Parainfectious myelitis, a better term for transverse myelitis, presents three distinct patterns. Understanding these patterns aids in predicting patient outcomes and neurological dysfunction.
Area of Science:
- Neurology
- Neuroimmunology
Background:
- Parainfectious myelitis is a neurological condition affecting the spinal cord.
- Transverse myelitis is a commonly used term, but may not fully capture the extent of the lesions.
Purpose of the Study:
- To investigate the site, extent, and severity of lesions in parainfectious myelitis.
- To identify distinct patterns of parainfectious myelitis with unique clinical, electrophysiological, and MRI features.
- To correlate specific features with patient prognosis.
Main Methods:
- Retrospective study of 17 parainfectious myelitis patients.
- Analysis of lesion characteristics using MRI.
- Correlation of clinical signs, electrophysiological findings, and imaging with patient outcomes.
Main Results:
- Three distinct patterns of parainfectious myelitis were identified: focal segmental, ascending, and disseminated.
- Each pattern exhibited unique clinical presentations, electrophysiological findings, and MRI features.
- Severe autonomic dysfunction, paraspinal muscle denervation, "dense" MRI lesions, and absent somatosensory evoked potentials were associated with poor outcomes.
Conclusions:
- "Parainfectious myelitis" is proposed as a more accurate term due to the extensive vertical lesion involvement.
- Classification into three subgroups can enhance understanding of anatomical and physiological dysfunction.
- This classification may improve the prediction of outcomes in parainfectious myelitis.