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It is the protrusion of reotal mucosa through and opening during defeeation or any strainous act. It may be
It is the tract like ostula but mostly having single opening situated at socral area. It is the sinus where hairs(present) get embedded inside it so it is called pilonoidol (pilus-hairs, pidol-nest)
As the hair plays important role so hairy persons who are having excessive hairs around the anus
In barbors it may occurs in between finger due to repeated contact with hairs.
Minor ulceration get aggievated due to irrigation by hairs and somehow hair get entry into the ulcerated wound and remains as a foreign body creating the sinus.
These are dilated haemorrhoidal venous plexus in anal canal. These are divided in to internal piles (or) external piles
Fistula is tract lined by unhealthy granulation, tissue connecting interior to exterior perinnal area. These tracks communicate. It has external opening at skin surface around the anus and internal opening inside the anal canal or high in the rectum. One of the opening may absent either external or internal.