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External and internal hemorrhoids

external and internal hemorrhoids The image above shows the rectum and anus. The external sphincter is at the bottom and the internal shpincter is shown by the pectinate line at the top.
In this figure
A represents an internal hemorrhoid,
B represents an external prolapsed hemorrhoid,
C is a mixed hemorrhoid (both internal and external),
D is a thrombosed hemorrhoid and
E is an external hemorrhoid.

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