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Isolated sarcoid myopathy.
Christian Berger1, Clemens Sommer, Hans-M Meinck
1Department of Neurology, University of Heidelberg, Im Neuenheimer Feld 400, 69120 Heidelberg, Germany. christian_Berger@med.uni-heidelberg.de
Muscle & Nerve
|October 4, 2002
Summary
This study presents a rare case of isolated sarcoid myopathy, a muscle disorder linked to sarcoidosis, in a 75-year-old woman. The patient experienced progressive limb weakness without systemic sarcoidosis symptoms.
Area of Science:
- Neurology
- Immunology
- Pathology
Background:
- Sarcoidosis is a multisystem inflammatory disease characterized by noncaseating granulomas.
- Myopathy can be a rare manifestation of sarcoidosis, often associated with systemic involvement.
- Isolated sarcoid myopathy without concurrent systemic disease is exceptionally uncommon.
Observation:
- A 75-year-old female presented with a 5-year history of progressive, painless limb weakness and muscle wasting, predominantly affecting pretibial muscles.
- She had a past history of mild pulmonary sarcoidosis 20 years prior.
- Neurological examination revealed no sensory deficits.
Findings:
- Laboratory tests showed hypercalcemia (serum calcium 3.2 mmol/L) and elevated serum angiotensin-converting enzyme (ACE; 38.2 U/L).
- Extensive work-up for systemic sarcoidosis, including antibody studies, yielded negative results.
- Muscle biopsy confirmed the presence of noncaseating epithelioid granulomas, multinuclear giant cells, and lymphoplasmacytic infiltration, consistent with sarcoid myopathy.
Implications:
- This case highlights that sarcoid myopathy can occur in isolation, without evidence of active systemic sarcoidosis.
- Early diagnosis and treatment with corticosteroids, such as methylprednisolone, can lead to partial recovery.
- Further research is warranted to understand the pathogenesis and optimal management of isolated sarcoid myopathy.