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Post-traumatic segmental myoclonus associated with bilateral olivary hypertrophy
G Birbamer1, F Gerstenbrand, M Kofler
1Department of Neurology, University of Innsbruck, Austria.
Acta Neurologica Scandinavica
|June 1, 1993
Summary
Segmental myoclonus, a type of involuntary muscle twitching, can occur after severe brainstem injury. Magnetic resonance imaging (MRI) revealed specific lesions in the "myoclonic triangle" pathway, indicating unique pathological changes.
Area of Science:
- Neurology
- Neuroimaging
- Pathology
Background:
- Severe brainstem injury can lead to delayed neurological complications.
- Segmental myoclonus is a rare movement disorder characterized by involuntary, rhythmic muscle contractions.
Observation:
- Three patients developed segmental myoclonus 11-18 months post-brainstem injury.
- Clinical signs included palatal myoclonus, vertical ocular myorhythmia, and upper extremity myoclonus ("wing beating").
Findings:
- Magnetic resonance imaging (MRI) identified lesions in the dentato-rubro-olivary pathway (the "myoclonic triangle").
- Enlargement and increased signal intensity of the inferior olives were observed, particularly on proton density weighted images.
- These MRI findings suggest pathological changes distinct from typical gliosis.
Implications:
- This study highlights a specific neuroanatomical correlate for post-brainstem injury segmental myoclonus.
- Understanding these MRI findings can aid in diagnosing and characterizing this delayed neurological sequela.
- The distinct signal characteristics may offer insights into the underlying pathophysiology of post-traumatic myoclonus.