Idiopathic Inflammatory Myopathy with Delayed Finger Opening Resembling Grip Myotonia

Grip 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....

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Bibliographic Details
Published in:Internal Medicine 2023/11/15, Vol.62(22), pp.3397-3400
Main Authors: Kanbayashi, Takamichi, Kobayashi, Shunsuke, Hatanaka, Yuki, Shimizu, Jun, Sonoo, Masahiro
Format: Article
Language:English
Subjects:
Adult
Case Report
delayed finger opening
extensor digitorum
Finger
Hand Strength
Humans
idiopathic inflammatory myopathy
Inflammation
Internal medicine
Male
Muscle, Skeletal
Myopathy
Myositis - diagnosis
Myotonia
Myotonia - diagnosis
Myotonic Dystrophy
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Summary:Grip 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.
ISSN:0918-2918
1349-7235
DOI:10.2169/internalmedicine.1545-22