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Intranuclear inclusions in muscle, nervous tissue, and adrenal gland
Abstract:
A 30-year-old man had had chronic progressive wasting and weakness of muscles for 17 years. A muscle biopsy 5 years prior to death revealed myopathic changes were rimmed vacuoles and intranuclear inclusions which corresponded to "inclusion body myositis". At autopsy, intranuclear inclusions were observed in neurons, oligodendroglia, and in parenchymal cells of the adrenal medulla. Ultrastructurally, the inclusions in muscles, nervous tissue, and adrenal medulla were identical and consisted of abnormal tubulolinear structures measuring 10-20 nm in diameter. Similar inclusions have been reported in muscles with "inclusion body myositis" and in the nervous system with "neuronal intranuclear hyaline inclusion disease", respectively. Absence of clinical symptoms related to the CNS and adrenal gland, and well-preserved parenchymal cells in these organs of our patient suggest a benign nature of the disease except in the muscular system. Attempts to isolate a virus from the brain were fruitless . This patient may serve to connect both diseases in muscles and the nervous system, and to disclose the etiology of these inclusions.
Insights
This study details a patient with inclusion body myositis (IBM) whose autopsy revealed identical abnormal protein inclusions in muscles, brain, and adrenal medulla. This finding suggests a potential link between IBM and neuronal intranuclear hyaline inclusion disease.
Area of Science:
- Neurology
- Pathology
- Muscle Diseases
Background:
- Inclusion body myositis (IBM) is a progressive muscle-weakening disease.
- Neuronal intranuclear hyaline inclusion disease (NIHID) affects the central nervous system.
Observation:
- A 30-year-old male patient exhibited 17 years of progressive muscle wasting and weakness.
- Muscle biopsy revealed rimmed vacuoles and intranuclear inclusions characteristic of IBM.
- Autopsy showed identical intranuclear tubulolinear inclusions (10-20 nm) in neurons, oligodendroglia, and adrenal medulla.
Findings:
- The ultrastructural morphology of inclusions was consistent across muscle, nervous tissue, and adrenal medulla.
- Despite the presence of inclusions, the patient showed no clinical symptoms related to the CNS or adrenal gland.
Implications:
- This case potentially links inclusion body myositis and neuronal intranuclear hyaline inclusion disease.
- The findings may offer insights into the etiology of these distinct but pathologically similar conditions.
- Further research is needed to understand the nature and origin of these abnormal inclusions.