Extensor tenosynovectomy in a 69-year-old, right-hand-dominant male with negative rheumatologic work up and persistent extensor tenosynovitis: A, MRI showing isolated 4th extensor compartment involvement. B, Midline dorsal approach exposing proliferative extensor tenosynovitis. C, Wrist after tenosynovectomy. Note that rheumatologic studies, histopathology, and cultures were inconclusive as to etiology of extensor tenosynovitis, which is not uncommon with such conditions.