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The notorious anus.

Hemorrhoids occur when normal venous dilitations in the submucosa ‘loosen’ and bulge out. Internal hemorrhoids are insensitive to somatic pain and are located superior to the dentate line, whereas external hemorrhoids are sensitive to somatic pain and lie below the dentate line. This is why internal hemorrhoids may be treated by rubberband ligation.

Anorectal varices (recall the anastomosis giving rise to these) may be distinguished from hemorrhoids because varices will disappear when pressure is applied to them and reappear rapidly when pressure is released.
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