A stenosing tenosynovitis is a specific form of tenosynovitis typically affecting the tendons that run through osseofibrous tunnels, each enclosed in its own synovial sheath. The tunnel itself lies over cortical bone and is covered by a structure referred to (depending on the location) as a pulley or retina.
Their diagnosis is based on typical sonographic findings of hypertrophy of a retinaculum or pulley.
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