What is the cyst that forms on a tendon sheath, typically on the hand, wrist, or ankle?

• A. Tarsal tunnel syndrome
• B. Anesthetic
• C. Ganglion cyst
• D. Deep venous thrombosis

Answer: (C)

Ganglion cysts are mucin-filled sacs that arise from the synovial lining of a joint capsule or tendon sheath. They commonly appear on the hand or wrist and can also form near the ankle. The cyst is filled with thick, jelly-like fluid and may be connected to the joint or tendon sheath by a small stalk. It’s usually a benign lump that can be painless or tender and may change in size with activity. This description fits a ganglion cyst the best.

The other options describe different things: tarsal tunnel syndrome is nerve compression, not a cyst; an anesthetic is a drug used to numb tissue; deep venous thrombosis is a blood clot in a deep vein.