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['Inclusion body'-myositis]
U A Badrising1, M L Maat-Schieman, S G van Duinen
1Academisch Ziekenhuis, Leiden.
Abstract:
In 3 patients, a 72-year-old man, a 62-year-old man and a 73-year-old woman with weakness of respectively the quadriceps femoris, the finger flexors and the pharyngeal muscles, the diagnosis of 'inclusion body myositis' was made. This is a rare, slowly progressive skeletal muscle disorder which is more common in men and after the age of fifty. The activity of serum creatine kinase is often 2-5 times the highest normal value. The electromyogram pattern is myopathic, but can also display neuropathic changes (exclusively). Inclusion body myositis is often misdiagnosed, which can lead to an inappropriate treatment or approach. A frozen muscle biopsy is needed to make cryostat sections for demonstration of myositis with rimmed vacuoles.
Insights
Inclusion body myositis is a rare, progressive muscle disorder. Early diagnosis via muscle biopsy is crucial to avoid misdiagnosis and ensure appropriate patient management.
Area of Science:
- Neurology
- Muscle Disorders
Background:
- Inclusion body myositis (IBM) is a rare, slowly progressive skeletal muscle disorder.
- It predominantly affects men over the age of fifty.
Observation:
- Three patients (72M, 62M, 73F) presented with progressive muscle weakness affecting quadriceps femoris, finger flexors, and pharyngeal muscles.
- Serum creatine kinase levels were elevated (2-5 times normal).
- Electromyography showed myopathic patterns, with occasional neuropathic changes.
Findings:
- The diagnosis of inclusion body myositis was confirmed in all three patients.
- Muscle biopsy with cryostat sections is essential for diagnosing IBM, revealing characteristic rimmed vacuoles.
Implications:
- Misdiagnosis of IBM can lead to inappropriate treatment strategies.
- Accurate and timely diagnosis through muscle biopsy is critical for effective patient care and management of this rare myopathy.