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Purpose: Localized pigmented villonodular synovitis (LPVNS) is a rare lesion that can affect any joint, although it is most frequently found in the knee. Clinically, it is difficult to diagnose. Radiographs are usually within normal limits. Type of Study: Case series. Methods: We present a series of 9 cases of LPVNS of the knee in 9 patients with an average age of 36 years. In 7 of the 9 cases, the...