Pilonidal sinus
A sinus of the natal cleft containing hair that often becomes infected.
It is thought that sinuses arise from penetration of hairs subcutaneously with secondary infection. A post anal pilonidal sinus typically occurs around 2 cm posterior to the anus and extends superiorly and subcutaneously for about 2–5 cm.
The sinus only becomes symptomatic when infection causes an abscess with swelling, tenderness and discharge.
Abscesses are drained, deroofed and cleaned under general anaesthetic. The cavity is left open to granulate. Pilonidal sinuses tend to recur.
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