A cyst is a closed sac, having a distinct membrane and division compared
with the nearby tissue. Hence, it is a cluster of cells that has
grouped together to form a sac (not unlike the manner in which water
molecules group together, forming a bubble); however, the distinguishing
aspect of a cyst is that the cells forming the "shell" of such a sac
are distinctly abnormal (in both appearance and behaviour) 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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