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Hallervorden-Spatz disease: MR and pathologic findings
M Savoiardo1, W C Halliday, N Nardocci
1Department of Neuroradiology, Istituto Nazionale Neurologico C. Besta, Milano, Italy.
AJNR. American Journal of Neuroradiology
|January 1, 1993
Summary
Magnetic Resonance Imaging (MRI) reveals characteristic findings in Hallervorden-Spatz disease (HSD). The "eye-of-the-tiger" sign on MRI correlates with specific pathological changes in the pallidum.
Area of Science:
- Neuroimaging
- Neuropathology
- Neurodegenerative Diseases
Background:
- Hallervorden-Spatz disease (HSD) is a rare, inherited neurodegenerative disorder.
- Characteristic neuroimaging findings are crucial for diagnosis and understanding disease mechanisms.
Purpose of the Study:
- To compare Magnetic Resonance (MR) findings in clinically diagnosed Hallervorden-Spatz disease (HSD) with histopathological findings.
- To elucidate the pathological basis of specific MR signal abnormalities observed in HSD.
Main Methods:
- Retrospective analysis of MR imaging (0.5-T and 1.5-T) in eight HSD cases.
- Correlation of MR findings with detailed histopathological evaluation of two pathologically confirmed HSD cases.
- CT scans were also performed in six patients.
Main Results:
- 1.5-T MR imaging revealed low signal intensity in the pallidum and a high signal intensity anteromedial area (eye-of-the-tiger sign).
- Pathology confirmed iron deposition in dense tissue corresponding to low signal areas and vacuolization in loose tissue corresponding to the high signal 'eye-of-the-tiger' area.
- 0.5-T imaging showed less evident low signal intensity, but gradient-echo sequences improved demonstration.
Conclusions:
- MR findings, particularly the 'eye-of-the-tiger' sign, correlate with specific neuropathological features of HSD.
- Low T2 signal intensity at 1.5 T reflects iron deposits in dense tissue.
- High signal intensity of the 'eye-of-the-tiger' sign represents areas of loose tissue with vacuolization in the pallidum.