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Myopathies with finger flexor weakness: Not only inclusion‐body myositis
Author(s) -
Nicolau Stefan,
Liewluck Teerin,
Milone Margherita
Publication year - 2020
Publication title -
muscle and nerve
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.025
H-Index - 145
eISSN - 1097-4598
pISSN - 0148-639X
DOI - 10.1002/mus.26914
Subject(s) - inclusion body myositis , weakness , muscle biopsy , muscle weakness , medicine , myotonic dystrophy , proximal muscle weakness , myotonia , myositis , flexor muscles , myopathy , muscular dystrophy , physical medicine and rehabilitation , pathology , anatomy , biopsy
Muscle disorders are characterized by differential involvement of various muscle groups. Among these, weakness predominantly affecting finger flexors is an uncommon pattern, most frequently found in sporadic inclusion‐body myositis. This finding is particularly significant when the full range of histopathological findings of inclusion‐body myositis is not found on muscle biopsy. Prominent finger flexor weakness, however, is also observed in other myopathies. It occurs commonly in myotonic dystrophy types 1 and 2. In addition, individual reports and small case series have documented finger flexor weakness in sarcoid and amyloid myopathy, and in inherited myopathies caused by ACTA1 , CRYAB , DMD , DYSF , FLNC , GAA , GNE , HNRNPDL , LAMA2 , MYH7 , and VCP mutations. Therefore, the finding of finger flexor weakness requires consideration of clinical, myopathological, genetic, electrodiagnostic, and sometimes muscle imaging findings to establish a diagnosis.