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Characteristic magnetic resonance imaging findings in Machado-Joseph disease
Y Murata1, S Yamaguchi, H Kawakami
1Third Department of Internal Medicine, Hiroshima University School of Medicine, Japan.
Objective:
To clarify the characteristic magnetic resonance imaging (MRI) findings in patients with Machado-Joseph disease (MJD) diagnosed by genetic analysis.
Patients And Methods:
Using MRI, we examined 31 patients genetically diagnosed as having MJD, 20 patients with sporadic olivopontocerebellar atrophy, and 26 control subjects.
Results:
The MRIs of patients with MJD disclosed remarkably reduced width of the superior cerebellar peduncles, atrophy in the frontal and temporal lobes, diminished transverse diameter of the globus pallidus, and decreased anteroposterior and transverse diameters of the pons, which correlated with the width of the middle cerebellar peduncle. The width of the superior cerebellar peduncles also correlated with the diameter of the dentate or red nucleus in patients with MJD, but not in controls or in patients with sporadic olivopontocerebellar atrophy. On T2- and/or proton-weighted axial MR imaging, a high signal intensity in the transverse pontine fibers was observed in 14 (45.2%) of 31 patients with MJD and in all patients with sporadic olivopontocerebellar atrophy, but not in any controls.
Conclusion:
Affected afferent and efferent cerebellar tracts and atrophy of the frontal and temporal lobes and globus pallidus are characteristics of MRI of patients with MJD.
Insights
Machado-Joseph disease (MJD) shows characteristic MRI findings including cerebellar peduncle reduction and brain atrophy. These magnetic resonance imaging features aid in diagnosing MJD and differentiating it from other neurodegenerative conditions.
Area of Science:
- Neuroimaging
- Neurology
- Genetics
Background:
- Machado-Joseph disease (MJD), also known as spinocerebellar ataxia type 3, is an autosomal dominant neurodegenerative disorder.
- Genetic diagnosis is definitive for MJD, but characteristic neuroimaging findings can aid in its identification.
Purpose of the Study:
- To identify and characterize the distinctive magnetic resonance imaging (MRI) findings in genetically confirmed patients with Machado-Joseph disease (MJD).
Main Methods:
- MRI scans of 31 genetically diagnosed MJD patients were analyzed.
- Comparative analysis included 20 patients with sporadic olivopontocerebellar atrophy and 26 healthy controls.
- Quantitative measurements of brain structures and qualitative assessment of signal intensities were performed.
Main Results:
- MJD patients exhibited reduced superior cerebellar peduncles, frontal/temporal lobe atrophy, diminished globus pallidus diameter, and decreased pons dimensions.
- Superior cerebellar peduncle width correlated with middle cerebellar peduncle diameter and dentate/red nucleus size in MJD.
- High signal intensity in transverse pontine fibers was observed in 45.2% of MJD patients, a finding also present in sporadic olivopontocerebellar atrophy but absent in controls.
Conclusions:
- Characteristic MRI findings in MJD include atrophy of cerebellar tracts, frontal/temporal lobes, and globus pallidus.
- These neuroimaging features, particularly the specific patterns of cerebellar and brainstem involvement, are crucial for diagnosing MJD.
- MRI can help differentiate MJD from sporadic olivopontocerebellar atrophy based on specific structural and signal abnormalities.