A cyst is a closed fluid-filled sac that is formed in the tissues, bones, joints or tendons. Common locations for cysts on the foot include the top of the foot, on the sole of the foot or on the back of the heel in the Achilles tendon. Cysts can also occur within the bone in the ankle. Symptoms typically include a constant dull ache, stiffness, limited motion, snapping or locking of the effected joint. Cysts can range in size from a small pea sized lump to larger cysts being around 2.5 cm in diameter.
What are the causes of Cysts?
A ganglion cyst is a tumor or swelling on top of a joint or the covering of a tendon (tissue that connects muscle to bone). It looks like a sac of liquid (cyst). Inside the cyst is a thick, sticky, clear, colorless, jellylike material. Depending on the size, cysts may feel firm or spongy.
One large cyst or many smaller ones may develop. Multiple small cysts can give the appearance of more than one cyst, but a common stalk within the deeper tissue usually connects them. This type of cyst is not harmful and accounts for about half of all soft tissue tumors of the hand.
Ganglion cysts, also known as Bible cysts, are more common in women, and 70% occur in people between the ages of 20-40. Rarely, ganglion cysts can occur in children younger than 10 years.