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Infantile spongiform leukoencephalopathy: clinical and neuropathologic findings
Sumimasa Yamashita1, Hiroko Iwamoto, Masamichi Hara
1Division of Child Neurology, Kanagawa Children's Medical Center, Kanagawa, Japan.
Insights
This study presents a case of spongy leukoencephalopathy in an infant, revealing a novel genetic disorder affecting myelin metabolism. The findings highlight disturbed white matter development without metabolic abnormalities.
Area of Science:
- Neuroscience
- Genetics
- Biochemistry
Background:
- Spongy leukoencephalopathy (SL) is a rare group of inherited white matter disorders.
- Early diagnosis and understanding of SL pathogenesis are crucial for potential therapeutic interventions.
Observation:
- A 10-month-old male infant presented with neurological symptoms including feeding difficulties, nystagmus, and spasticity.
- Radiological imaging revealed diffuse white matter abnormalities, while biochemical tests showed no detectable abnormalities.
- Neuropathological examination demonstrated characteristic vacuolar changes, spongy alterations, astrocytic gliosis, and vascular hyperplasia in the white matter.
Findings:
- Severe disturbance in white matter myelin development was observed, distinct from normal infant development.
- Electron microscopy revealed unique vacuolar structures with myelin alterations, including intralamellar splits.
- The patient's presentation and neuropathological findings suggested a new genetic disorder of myelin metabolism, differentiating it from known inborn errors of metabolism.
Implications:
- This case expands the spectrum of leukoencephalopathies and underscores the complexity of myelin development disorders.
- Identification of a potential new genetic disorder necessitates further research into its specific genetic basis and molecular mechanisms.
- Understanding this novel disorder could pave the way for targeted diagnostic approaches and future therapeutic strategies for myelin-related diseases.
Abstract:
A 10-month-old male with spongy leukoencephalopathy is presented. Neurologic manifestations included feeding difficulties, horizontal nystagmus, and spasticity at 5 months of age. His head circumference was within the normal range. Radiologic examination demonstrated a diffuse white matter disorder. There was no detectable biochemical abnormality. He followed a neurologically progressive course. Neuropathologic findings revealed characteristic vacuolar changes in the white matter located immediately under the cortex with spongy alterations of the entire subcortical white matter, including intense astrocytic gliosis and marked vascular hyperplasia. Tissue of the matrix was destroyed in the deep white matter to form cystic areas of degeneration. White matter myelin development was severely disturbed compared with that of a normal infant of the same age. Cortical neuronal cells were preserved and did not reveal any specific abnormalities. Electron microscopic examination revealed that each vacuole in the white matter was covered by several layers of myelin structures, and intralamellar splits of white matter myelin were observed. These neuropathologic findings are also observed in some known inherent metabolic disorders. The present patient, however, did not demonstrate any metabolic abnormalities. These findings suggested a new genetic disorder of myelin metabolism.