Increasing rigidity and tenderness indicates an increased
likelihood of perforation and peritonitis.
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The purpose of perforation depending on what one is talking
about. In the case of oil well, the purpose of perforation is to
allow the oil or gas to flow more easily to the wellbore to get it
out of the ground.
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Perforation means that there is a hole of some size in some
organ ~ See related link below to several examples as to how the
word "Perforation" is applied to a medical setting .