Finger Synovial Cyst
Definition
This is a benign swelling appearing most often on the palmar side of the base of the finger, not visible but sometimes palpable and especially painful when pressing. It develops most often in contact with the flexor tendon or one of its pulleys and is filled with synovial fluid, the fluid that allows smooth gliding of the tendon.
What are the causes?
Most of the time, no cause is found. Its appearance may, however, follow periods of manual exertion.
What are the symptoms?
The main symptoms are pain at the base of the finger on its palmar side with intensity that fluctuates over time. This causes discomfort during gripping.
What tests may be requested?
An ultrasound is usually requested to confirm the clinical diagnosis.
How is this condition treated?
If the discomfort is significant, surgical treatment with complete excision in contact with the tendon and its pulley is most often offered. This is surgery performed on an outpatient basis with local anesthesia of the upper limb.
What are the risks of the procedure?
Risks inherent to any surgery:
complex regional pain syndrome (formerly known as «algoneurodystrophic syndrome»): the hand becomes red, warm, swollen, and painful with persistent «electric» pain. This syndrome can last several months.
infection (phlegmon of the flexor tendon sheath)
Finger stiffness: in case of inadequate self-mobilization of the finger postoperatively. Rehabilitation sessions will then be offered.
Recurrence of the cyst