A Case of Coccidioides Synovitis of the Knee Presents Clinically as Pigmented Villonodular Synovitis

Few cases of primary coccidioides synovitis of the knee have been reported in the literature, almost all of which have been before the widespread use of magnetic resonance imaging. We describe the case of a man presenting with findings classically associated with pigmented villonodular synovitis who was subsequently diagnosed with primary coccidioidal synovitis of the knee. This case outlines the clinical, radiographic, and pathological characteristics of coccidioidal synovitis that has yet to be outlined in the literature.