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Agenesis Of The Left Hemidiaphragm- A Case Report
A cyst is a closed sac, having a distinct membrane and division[clarification needed] compared to the nearby tissue. It may contain air, fluids, or semi-solid material. A collection of pus is called an abscess, not a cyst. Once formed, a cyst may sometimes resolve on its own. Whether a cyst that fails to resolve may need to be removed by surgery will depend on what type of cyst it is and where in the body it has formed.
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