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In vivo diagnosis of Hallervorden-Spatz disease
J R Ostergaard1, T Christensen, K N Hansen
1Department of Paediatrics, Aarhus Kommunehospital, University Hospital of Aarhus, Denmark.
Abstract:
The authors present the MRI findings of two children with insidious walking difficulties, signs of corticospinal tract involvement, and signs and symptoms of extrapyramidal dysfunction such as rigidity and generalized dystonia, the latter with predominance of oromandibular involvement. In one child, MRI revealed prominent hypo-intensity in the globus pallidus and in the substantia nigra on T2-weighted spin echo images, consistent with iron deposition and thus with previous post-mortem findings of Hallervorden-Spatz disease. In the other case, the hypo-intensity was restricted to the globus pallidus, in which a small area of hyperintensity in its internal segment was demonstrated--the so called 'eye-of-the-tiger' sign. The authors propose that a combination of previously mentioned neurological signs with these specific MRI findings is highly suggestive of an in vivo diagnosis of the late infantile type of HSD.
Insights
Magnetic Resonance Imaging (MRI) aids in diagnosing Hallervorden-Spatz disease (HSD) in children. Specific MRI findings, like T2-weighted hypo-intensity in the globus pallidus, suggest in vivo diagnosis of HSD.
Area of Science:
- Neuroimaging
- Pediatric Neurology
- Neurodegenerative Diseases
Background:
- Hallervorden-Spatz disease (HSD), now known as neurodegeneration with brain iron accumulation (NBIA), is a rare, inherited neurometabolic disorder.
- Clinical presentation includes progressive extrapyramidal dysfunction (dystonia, rigidity) and corticospinal tract involvement, leading to motor impairment.
- Accurate in vivo diagnosis is challenging, often relying on post-mortem confirmation or genetic testing.
Observation:
- Two pediatric cases presented with insidious gait difficulties, corticospinal tract signs, and extrapyramidal dysfunction (rigidity, generalized dystonia).
- Oromandibular involvement was a prominent feature of dystonia in one child.
- Specific neuroimaging findings were observed using T2-weighted spin echo MRI sequences.
Findings:
- Case 1: MRI revealed marked hypo-intensity in the globus pallidus and substantia nigra, indicative of iron deposition.
- This pattern is consistent with established post-mortem findings in Hallervorden-Spatz disease.
- Case 2: MRI showed hypo-intensity confined to the globus pallidus with a characteristic 'eye-of-the-tiger' sign (internal globus pallidus hyperintensity).
Implications:
- The combination of specific clinical signs and distinctive MRI findings ('eye-of-the-tiger' sign, globus pallidus/substantia nigra hypo-intensity) strongly suggests an in vivo diagnosis of late infantile HSD.
- This neuroimaging approach may facilitate earlier diagnosis and management of NBIA disorders.
- Further research into neuroimaging biomarkers for NBIA is warranted.