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The Tenosynovitis of Fingers Associated with Transthyretin Amyloidosis.

Background: Amyloidosis treatment has advanced rapidly along with the discovery of drugs to prevent amyloid deposition. Therefore, it is vital to detect amyloidosis at an early stage. Wild-type transthyretin, which can cause carpal tunnel syndrome, may also cause finger tenosynovitis. However, the correlation between wild-type transthyretin amyloid and finger tenosynovitis is unclear. Here, we investigated pathological and clinical findings for 20 patients with finger tenosynovitis who underwent operation at our hospital to determine the frequency of transthyretin amyloid deposition in idiopathic finger tenosynovitis. Methods: To check for the presence of amyloid deposition, all specimens (tendon synovium tissue or flexor tendon sheath) resected during the operation were stained by the direct fast scarlet method. Amyloid-positive specimens were evaluated by immunohistochemical staining using an anti-transthyretin antibody. Patient characteristics were evaluated with respect to amyloid presence. Results: Thirteen (65%) of 20 finger tenosynovitis cases had amyloid deposition. Nine (69.2%) of the 13 amyloid-positive cases exhibited extensive transthyretin staining and were considered to have transthyretin amyloid. Amyloid deposition was more frequent in men. The mean number of fingers with tenosynovitis was significantly higher in amyloid-positive cases (3.8 fingers) than in amyloid-negative cases (2.0 fingers). Conclusions: Men with multiple finger tenosynovitis tended to have transthyretin amyloid deposition. Our results support that multiple finger tenosynovitis may serve as an initial indication of evaluation for transthyretin amyloidosis.

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