Mucus Cyst:

Mucus Cysts occur in the fingers at the distal interphalangeal (DIP) joint- the joint closes to the finger tip. These cysts can be firm and painful which typically occur on the sides of the fingers next to the far finger joint. These cysts can even rupture if compressed. Mucus cysts are typically associated with joint arthritis in the DIP. These cysts should not be aspirated since the fluid will simply reaccumulate. Additionally, aspiration could result in an infection leading to further degenerative changes in the joint.

The diagnosis of a mucus cyst is based on physical exam and x-rays. X-rays typically reveal bone spurs and mild to moderate degenerative changes. Treatment for these cysts requires surgical resection of the bone spurs. With removal of the spurs, the cyst will resolve. During surgery if the joint is unstable, a pin might be placed across the joint to hold it stable for approximately two to three weeks. However, if the joint is too arthritic, a fusion might be required to alleviate pain.

Postoperative recovery may differ based on if the joint is pinned or fused. If the joint is pinned, it will be removed after two to three weeks. If the joint is fused, the finger will be protected for approximately six weeks until bony union is confirmed by x-ray.

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