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Inclusion body myositis: an underdiagnosed condition?
N D Hopkinson1, C Hunt, R J Powell
1Department of Immunology, University Hospital, Queen's Medical Centre, Nottingham, United Kingdom.
Annals of the Rheumatic Diseases
|February 1, 1993
Summary
Inclusion body myositis, a rare inflammatory myopathy, presents as slowly progressive muscle weakness in older adults. This study highlights its underdiagnosis in the UK, emphasizing characteristic pathological findings for accurate diagnosis.
Area of Science:
- Neurology
- Pathology
Background:
- Inclusion body myositis (IBM) is an inflammatory myopathy with distinct clinical and histopathological features.
- IBM has been infrequently reported in the United Kingdom.
Purpose of the Study:
- To present the clinicopathological features of IBM patients diagnosed in Nottingham between 1986 and 1990.
- To assess the prevalence and diagnostic challenges of IBM in the UK.
Main Methods:
- Retrospective analysis of 1319 muscle biopsy samples processed in the laboratory.
- Identification of patients with rimmed vacuoles and definite/probable IBM based on published criteria.
Main Results:
- 17 patients showed rimmed vacuoles; 11 met criteria for definite or probable IBM.
- Mean age was 69.4 years (8:3 male:female ratio). Typical symptoms included slowly progressive, painless proximal lower limb weakness, muscle wasting, and early reflex loss.
- Median illness duration was 5 years; falls and distal weakness were common. Inflammatory markers were often normal or mildly elevated. Treatment was ineffective.
Conclusions:
- Inclusion body myositis is a distinct, likely underdiagnosed, cause of inflammatory myopathy in the UK.
- Clinical suspicion in older patients with insidious onset muscle weakness is crucial.
- Pathological examination for rimmed vacuoles, inflammation, and ultrastructural inclusions is essential for diagnosis.