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MRI findings of inferior olives in palatal myoclonus
T Yokota1, F Hirashima, T Furukawa
1Department of Neurology, Tokyo Medical and Dental University, Japan.
Abstract:
Four patients with palatal myoclonus (PM) were studied with magnetic resonance imaging (MRI). Increased signal intensity and bilateral enlargement of the inferior olives were recognized in two patients with bilateral PM, pontine haemorrhage and neuro-Behçet disease, and a similar olivary change on the contralateral side was noted in a case of pontine infarction with unilateral PM. These findings were consistent with the pathology. The changes were more obvious in proton density-weighted images than in T2-weighted images, which thus differ from the changes in common gliosis. The other patient with the syndrome of PM and progressive ataxia did not show any olivary change. These changes on MRI are considered to indicate pseudo-hypertrophy of the inferior olives, although this is not consistently shown by the imaging method.
Insights
Magnetic resonance imaging (MRI) revealed inferior olive changes in palatal myoclonus (PM) patients. These findings suggest pseudo-hypertrophy, aiding in understanding PM pathology.
Area of Science:
- Neurology
- Radiology
- Neuroimaging
Background:
- Palatal myoclonus (PM) is a rare condition affecting the palate.
- Understanding the neuroimaging correlates of PM is crucial for diagnosis and management.
Purpose of the Study:
- To investigate the magnetic resonance imaging (MRI) findings in patients with palatal myoclonus.
- To correlate imaging findings with the clinical presentation and underlying pathology of PM.
Main Methods:
- Retrospective analysis of MRI scans from four patients diagnosed with palatal myoclonus.
- Detailed examination of signal intensity and size of the inferior olives on various MRI sequences.
Main Results:
- Two patients with bilateral PM showed bilateral inferior olive enlargement and increased signal intensity on MRI.
- One patient with unilateral PM and pontine infarction exhibited contralateral olivary changes.
- MRI findings were more pronounced on proton density-weighted images compared to T2-weighted images.
- One patient with PM and progressive ataxia did not present with olivary changes.
Conclusions:
- MRI findings, including increased signal intensity and enlargement of the inferior olives, may indicate pseudo-hypertrophy in palatal myoclonus.
- These imaging changes are consistent with underlying pathology, such as pontine hemorrhage or infarction.
- MRI is a valuable tool for evaluating palatal myoclonus, though findings may not be consistently present.