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X-linked recessive bulbospinal neuronopathy. A clinicopathological study
G Sobue1, Y Hashizume, E Mukai
1Fourth Department of Internal Medicine, Aichi Medical University, Japan.
Brain : a Journal of Neurology
|February 1, 1989
Summary
This study reveals X-linked recessive bulbospinal neuronopathy primarily affects lower motor and sensory neurons, causing significant axon loss, particularly in the peripheral nervous system. Evidence suggests a distally accentuated axonopathy is the main pathological process.
Area of Science:
- Neurology
- Pathology
- Genetics
Background:
- X-linked recessive bulbospinal neuronopathy is a rare genetic disorder.
- Understanding its neuropathological basis is crucial for diagnosis and management.
Purpose of the Study:
- To conduct a clinicopathological investigation of X-linked recessive bulbospinal neuronopathy.
- To elucidate the involvement of motor and sensory neurons in the disease progression.
Main Methods:
- Morphological examination of autopsied cases and sural nerve biopsies.
- Quantitative analysis of primary sensory axons in the peripheral nervous system.
- Histopathological assessment of neuronal integrity across spinal cord segments and brainstem nuclei.
Main Results:
- Marked depletion of lower motor neurons observed throughout spinal segments and brainstem motor nuclei.
- Primary sensory neurons were less severely affected, with a distally accentuated axonopathy.
- Evidence of segmental demyelination and remyelination, with inconspicuous regeneration; unmyelinated fibers were preserved.
- Preservation of neurons in specific spinal cord nuclei (Onufrowicz, intermediolateral, Clarke's columns).
Conclusions:
- X-linked recessive bulbospinal neuronopathy presents as a significant lower motor and primary sensory neuronopathy.
- The primary pathology involves distal axonopathy with secondary demyelination.
- Specific neuronal populations remain preserved, offering insights into disease mechanisms.