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cyst
(sist)
bladder.
an abnormal closed epithelium-lined sac in the body that contains a liquid or semisolid substance. Most are harmless, but
they should be removed when possible because they occasionally may change into malignant growths, become infected, or obstruct
a gland. There are four main types of cysts: retention cysts, exudation cysts, embryonic cysts, and parasitic cysts.
a stage in the life cycle of certain parasites, during which they are enveloped in a protective wall.

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