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A difficult case
Eosinophilic myositis: could it be an adult-onset dystrophy?
  1. Katrina Reardon1,2,
  2. Penny McKelvie1,2
  1. 1 St Vincent's Hospital Melbourne Pty Ltd, Fitzroy, Victoria, Australia
  2. 2 Department of Medicine, The University of Melbourne, Fitzroy, Victoria, Australia
  1. Correspondence to Dr Katrina Reardon, St Vincent's Hospital Melbourne Pty Ltd, Fitzroy, VIC 3065, Australia; katrina.reardon{at}neurologynetwork.com.au

Abstract

A 40-year-old woman presented with a 20 kg weight loss and asymmetrical hip and shoulder girdle muscle weakness; she had a raised serum creatine kinase and mild peripheral blood eosinophilia. There was no evidence of a parasitic infection or vasculitis. A muscle biopsy showed eosinophilic myositis. Following treatment with oral corticosteroid, methotrexate and intravenous immunoglobulin infusion, her weakness initially mildly improved and her serum creatine kinase reduced. However, despite continued immunosuppression her condition progressed over 3 years. The pattern of muscle weakness suggested a muscular dystrophy. Genetic testing confirmed heterozygous calpain mutations consistent with limb girdle muscular dystrophy type 2A.

  • MUSCLE DISEASE
  • MUSCULAR DYSTROPHY
  • MYOPATHY
  • NEUROMUSCULAR
  • NEUROPATHOLOGY, MUSCLE

Data availability statement

There are no data in this work.

https://doi.org/10.1136/pn-2022-003448

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    Data availability statement

    There are no data in this work.

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    Footnotes

    • Contributors Both KR and PM have contributed equally in the preparation of this manuscript.

    • Funding The authors have not declared a specific grant for this research from any funding agency in the public, commercial or not-for-profit sectors.

    • Competing interests None declared.

    • Provenance and peer review Not commissioned; externally peer reviewed by Wojtek Rakowicz, Hampshire, UK.