Cyst

Definition of Cyst

A cyst is a closed pocket or pouch of tissue. It can be filled with air, fluid, pus, or other material.

Alternative Names for Cyst

Considerations

Cysts may form within any tissue in the body. Cysts within the lung generally are air-filled, while cysts involving the lymph system or kidneys are fluid-filled. Certain parasites, such as trichinosis, dog tapeworm (Toxocara canis), and echinococcus, can form cysts within the muscles, liver, brain, lungs, and eyes.

Cysts are common on the skin. They develop as a result of infection, clogging of sebaceous glands, or around foreign materials.

Common Causes

Home Care

Call your health care provider if

What to expect at your health care provider's office

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References for Cyst

Reviewed By: Michael Lehrer, M.D., Department of Dermatology, University of Pennsylvania Medical Center, Philadelphia, PA. Review provided by VeriMed Healthcare Network. Also reviewed by David Zieve, MD, MHA, Medical Director, A.D.A.M., Inc.

Review Date: October 28, 2008

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