Cyst
A cyst is a closed sac, having a distinct membrane and division compared with the nearby tissue.
It is a cluster of cells that has grouped together to form a sac however an aspect of a cyst is that the cells forming the "shell" of such a sac are distinctly abnormal when compared with all surrounding cells for that given location.
It may contain air, fluids, or semi-solid material. A collection of pus is called an abscess, not a cyst. Once formed, sometimes a cyst may resolve on its own. When a cyst fails to resolve, it may need to be removed surgically, but that would depend upon its type and location.
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Cyst Media
Relative incidences of different types of ovarian cysts
Relative incidence of odontogenic cysts
