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Rectum and anal canalSphincter musclesPiles (haemorrhoids)Tear (anal fissure)Skin tagTunnel (anal fistula)Abscess (collection of pus)Treatment shownThread (seton)
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The opening from below
A schematic view of the opening from below, with the front at the top and the patient’s left on the right, showing the lining, the two rings of sphincter muscle and the finding. This is not the patient’s examination or scan.