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Case Reports
Idiopathic inflammatory myopathy with delayed finger opening resembling grip myotonia: A case report.
- Takamichi Kanbayashi, Shunsuke Kobayashi, Yuki Hatanaka, Jun Shimizu, and Masahiro Sonoo.
- Department of Neurology, Teikyo University School of Medicine, Japan.
- Intern. Med. 2023 Nov 15; 62 (22): 339734003397-3400.
AbstractGrip myotonia can be a clue for the diagnosis of myotonic disorders. However, several clinical conditions cause delayed finger opening mimicking grip myotonia. We herein report a 44-year-old man with idiopathic inflammatory myopathy who presented with delayed finger opening resembling grip myotonia. The delayed finger opening differed from grip myotonia given the absence of the warm-up phenomenon and percussion myotonia, relative sparing of the thumb extension, and pronounced weakness of the extensor digitorum. Focusing on the extension of the thumb and other fingers may aid in the differentiation between delayed finger opening and true grip myotonia.
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