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Early, evolving Wallerian degeneration of the pyramidal tract in cerebrovascular diseases: MR study
T Orita1, T Tsurutani, A Izumihara
1Department of Neurosurgery, Shuto General Hospital, Yamaguchi, Japan.
Objective:
The purpose of this study was to demonstrate the early features of the Wallerian degenerative process and their relationship with the severity of motor deficit.
Materials And Methods:
Fourteen patients with infarction or hemorrhage of the basal ganglia were studied by MRI of the same coronal slice along the pyramidal line.
Results:
The earliest sign of abnormal signal intensity was detected 0.7 month after the initial insult. On proton-density (PD) imaging, low signal intensity was observed on 11 (73.3%) of 15 occasions from 0.7 to 2.0 months, and abnormal signal intensity was not detected 5 (83.3%) of 6 times from 2.1 to 3.7 months. High signal intensity was revealed on 11 (78.6%) of 14 occasions after 3.8 months. The widest extent of the low-intensity signal band on PD imaging was closely related to the severity of motor deficits at > 4 months.
Conclusion:
The development of the Wallerian degenerative process was divided into four stages by MRI. We conclude that the extent of Wallerian degeneration is related to the severity of motor deficit.
Insights
Magnetic resonance imaging (MRI) reveals distinct stages of Wallerian degeneration following basal ganglia insults. The extent of this degeneration correlates with the severity of motor deficits in patients.
Area of Science:
- Neuroimaging
- Neurology
- Pathology
Background:
- Wallerian degeneration is a key process following central nervous system injury.
- Understanding its early features is crucial for predicting functional outcomes.
Purpose of the Study:
- To characterize the early MRI features of Wallerian degeneration.
- To establish the relationship between degeneration extent and motor deficit severity.
Main Methods:
- MRI was performed on 14 patients with basal ganglia infarction or hemorrhage.
- Coronal slices along the pyramidal tract were analyzed over time.
Main Results:
- Abnormal signal intensity, indicative of degeneration, was first detected at 0.7 months post-insult.
- Proton-density (PD) imaging showed low signal intensity from 0.7-2.0 months and high signal intensity after 3.8 months.
- The extent of low-intensity signal on PD imaging correlated with motor deficit severity at later time points (>4 months).
Conclusions:
- MRI can delineate four distinct stages of Wallerian degeneration.
- The degree of Wallerian degeneration is a significant predictor of motor deficit severity.