Synovial Cyst of the Little Finger Originating From a Degenerative Wrist Joint

A 67-year-old woman had a painless tumor in the pulp of her left little finger, which was diagnosed as a synovial cyst. She underwent 2 surgeries to remove the cyst; however, she had a third recurrence. Magnetic resonance imaging revealed that the cyst originated from the flexor tenosynovitis associated with degenerative arthritis of the distal radioulnar joint and pisotriquetral joint. We performed flexor tenosynovectomy and a salvage procedure for the degenerative wrist joint with a Sauve-Kapandji procedure for distal radioulnar joint osteoarthritis and pisiformectomy for pisotriquetral joint arthritis. One year after surgery, the synovial cyst had not recurred, and the functional outcomes of the wrist joint were good. Flexor tenosynovectomy and concurrent joint salvage procedure may be good treatment choices for synovial cysts originating from the flexor tenosynovitis associated with a degenerative wrist joint.