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Tenosynovitis

Tenosynovitis is the of the fluid-filled sheath that surrounds a , typically leading to joint pain, swelling, and stiffness. Tenosynovitis can be either or noninfectious. Common manifestations of noninfectious tenosynovitis include de Quervain tendinopathy and stenosing tenosynovitis.

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Plain-language summary adapted from Wikipedia. Not medical advice.