![]() A mucous cyst can often be directly visualized in the region due to thinning of the skin. Frequently, a nail deformity will form in the region of the mucous cyst due to it pressing on the nail matrix. The cyst typically grows towards the area of the nail fold where nail plate growth occurs. The tissues then form a hard capsule known as a cyst around this fluid. The “kissing” osteophytes or bone spurs puncture the capsule of the joint, causing clear fluid from the joint surface to leak into the surrounding tissues. This is related to osteoarthritis frequently present in these joints. The mucous cyst occurs due to “kissing” osteophytes or bone spurs in the area of the DIP joints. What causes a Mucous Cyst?Īs the mucous cyst grows, it will often have a clear appearance due to the nature of the fluid-like material in your joints called synovial fluid. Most patients who develop a mucous cyst have wear and tear arthritis or osteoarthritis of the involved joint. It presents as a small, sometimes painful, nodule in the DIP joint area. The mucous cyst usually appears at the joint nearest to the fingernail, called the distal interphalangeal (DIP) joint, and can be found on the thumb or on any of the other fingers. Mucous cysts are small, fluid-filled sacs that form on the fingers and usually develop in patients 50 to 70 years of age. ![]()
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December 2022
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