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Hallervorden-Spatz Disease: Differential Diagnoses & Workup
Updated: Dec 7, 2006
- Overview
- Differential Diagnoses & Workup
- Treatment & Medication
- Follow-up
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Differential Diagnoses
Huntington Disease
Neuroacanthocytosis
Neuronal Ceroid Lipofuscinoses
Wilson Disease
Other Problems to Be Considered
The differential diagnosis includes other diseases presenting with extrapyramidal-pyramidal-dementia complex.
Wilson disease usually presents with tremors, rigidity, dementia, and pseudobulbar features and has an autosomal recessive mode of inheritance. Slit-lamp examination of the eye may reveal a Kayser-Fleischer ring. MRI exhibits the characteristic changes consisting of high-intensity lesions in the basal ganglia, thalami, and mid brain. The normal low intensity of red nuclei and SN surrounded by abnormal high signal intensity in the tegmentum of mid brain gives rise to the typical "face-of-the-giant panda" sign. Serum ceruloplasmin and copper studies are usually abnormal and help confirm the diagnosis. Neurological symptoms are reversible if treated early with copper chelation therapy; hence, early diagnosis is important.
The juvenile form of Huntington disease may be confused with HSD. Patients with the juvenile form of Huntington disease can have a predominantly akinetic-rigid syndrome (ie, Westphal variant). The differentiating features include autosomal dominant mode of inheritance and presence of caudate atrophy on MRI.
Juvenile neuronal ceroid lipofuscinosis may be difficult to distinguish from HSD. It is an inherited disorder characterized by storage of ceroid and lipofuscin in neuronal and other tissues. The symptoms start in early childhood with vision loss, retinitis pigmentosa, dementia, rigidity, and dystonia. In contrast to the infantile and late-infantile forms of the disease, generalized tonic-clonic seizures and myoclonic seizures are not very common. The diagnosis can be made on the basis of clinical presentation, electrophysiologic studies, and skin biopsy findings. The electroretinogram reveals markedly reduced amplitude, and visual and somatosensory evoked responses are increased. The characteristic fingerprint inclusion bodies are identified easily in eccrine sweat glands and in circulating lymphocytes.
Machado-Joseph disease is inherited as an autosomal dominant trait, and the clinical disease usually has its onset when the individual is older than 20 years. Ataxia and other signs of spinocerebellar dysfunction are predominant. Some affected children may have extrapyramidal features, but prominent ataxia and the inheritance pattern should help differentiate Machado-Joseph disease from HSD.
Neuroacanthocytosis is characterized by onset of prominent orofacial dyskinesia, chorea, dystonia, and cognitive changes in the third or fourth decade. Other features include self-mutilation, peripheral neuropathy, and seizures. Recognition of acanthocytes (red blood cells with irregular spine on the cell surface) in the peripheral smear can lead to the diagnosis. HARP syndrome, which is characterized by hypoprebetalipoproteinemia, acanthocytes, retinitis pigmentosa, and pallidal degeneration, is another form of neuroacanthocytosis. Clinically it presents with dyskinesias, dystonia, and progressive dementia. The lipoprotein electrophoresis reveals absence of prebeta fraction, and MRI exhibits hypointense signal intensities in the globus pallidus.
Rare metabolic disorders such as GM1 and GM2 gangliosidoses in children sometimes can have features similar to HSD, but they have other clinical features and lab abnormalities and are differentiated readily.
Workup
Laboratory Studies
- No biochemical markers have been found in HSD.
- Levels of copper, ceruloplasmin, lipids, amino acids, and acanthocytes typically are measured in the blood to exclude other conditions.
- Radionuclide scan reveals increased uptake of iron by the basal ganglia (Vakili, 1977).
- Cultured skin fibroblasts have been reported to accumulate iron 59Fe transferrin, but the isotope is no longer available for human use.
- Increased platelet monoamine oxidase B activity has been reported (Zimmerman, 1981).
- Bone marrow histiocytes and peripheral lymphocytes may demonstrate the presence of abnormal cytosomes including fingerprint, granular, and multilaminated bodies (Swaiman, 1983; Alberca, 1987). The characteristics of the material suggest the presence of ceroid lipofuscin.
Imaging Studies
- CT imaging is not very helpful but may exhibit hypodensity in the basal ganglia and some atrophy of the brain. Calcification in the basal ganglia in the absence of any atrophy also has been described.
- MRI has increased the likelihood of antemortem diagnosis of HSD (Felciani, 1994; Shah, 1999).
- The typical MRI appearance is of bilaterally symmetric hyperintense signal changes in anterior medial globus pallidus with surrounding hypointensity in the globus pallidus on T2-weighted images (see Image 1). These imaging features are fairly diagnostic of HSD and have been termed the "eye-of-the-tiger" sign (Sethi, 1988).
- The hyperintensity represents pathologic changes including gliosis, demyelination, neuronal loss, and axonal swelling, and the surrounding hypointensity is due to loss of signal secondary to iron deposition.
- Iodine 123 (123 I)-beta-carbomethoxy-3beta-(4-fluorophenyl) tropane (CIT) single-photon emission computed tomography (SPECT) and (123 I)-iodobenzamide (IBZM)-SPECT also have been used in making the diagnosis of HSD (Hermann, 2000).
Histologic Findings
See the microscopic description in Pathophysiology.
More on Hallervorden-Spatz Disease |
| Overview: Hallervorden-Spatz Disease |
Differential Diagnoses & Workup: Hallervorden-Spatz Disease |
| Treatment & Medication: Hallervorden-Spatz Disease |
| Follow-up: Hallervorden-Spatz Disease |
| Multimedia: Hallervorden-Spatz Disease |
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References
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Further Reading
Keywords
HSD, neurodegeneration with brain iron accumulation type 1, NBIA-1, late infantile neuroaxonal dystrophy, Hallervorden-Spatz disease, progressive extrapyramidal dysfunction, dementia, PANK2 gene, Hallervorden-Spatz syndrome
Differential Diagnoses & Workup: Hallervorden-Spatz Disease