Megacolon is an abnormal dilation of the colon (a part of the large intestines). The dilatation is often accompanied by a paralysis of the peristaltic movements of the bowel. In more extreme cases, the feces consolidate into hard masses inside the colon, called fecalomas (literally, fecal tumor), which can require surgery to be removed.
A human colon is considered abnormally enlarged if it has a diameter greater than 12Šcm in the cecum (it is normally less than 9Šcm), greater than 6.5Šcm in the
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