meg·a·rec·tum (m g  -rk tm)n. Extreme dilation of the rectum. |
megarectum
a greatly dilated rectum.
megarectum
A feces-filled rectum in which intrinsic electromechanical activity that would otherwise stimulate the external anal sphincter and puborectalis muscle has ceased, most common in the elderly, resulting in constipation. See Megacolon.
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