A cyst is a closed sac-like structure that is not a normal part of the
tissue where it is located. Cysts are common and can occur anywhere in
the body in people of any age. Sometimes they may be felt as an abnormal
or new lump or bump. Cysts usually are filled with air or other gases,
liquids such as pus, or semisolid substances like tissue debris or other
materials. Since cysts vary in size, they may be detectable only under a
microscope or they can grow so large that they displace normal organs
and tissues. The outer wall of a cyst is called the capsule.
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