
A pilonidal cyst, also referred to as a pilonidal abscess, pilonidal sinus or sacrococcygeal fistula, is a cyst or abscess near or on the natal cleft of the buttocks that often contains hair and skin debris. ==Signs and symptoms== Pilonidal cysts are often very painful, and typically occur between the ages of 15 and 35. Although usually found near...
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http://en.wikipedia.org/wiki/Pilonidal_cyst

A special kind of abscess that occurs in the cleft between the buttocks. Forms frequently in adolescence after long trips that involve sitting. ... (12 Dec 1998) ...
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pilonidal sinus a hair-containing sacrococcygeal dermoid cyst or sinus, often opening at a postanal dimple, believed to result from an infolding of skin in which hair continues to grow. These cysts cause no symptoms unless they become infected, but that is likely because of their location. Pain and swelling, with formation of an...
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http://www.encyclo.co.uk/local/21001

Type: Term See: pilonidal sinus
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http://www.medilexicon.com/medicaldictionary.php?t=22433

Pilonidal cyst: A special kind of abscess that occurs in the cleft between the buttocks. Forms frequently in adolescence after long trips that involve sitting. The word 'pilonidal' is derived from the Latin words pilus (meaning hair) and nidus (meaning nest).Common Misspellings: pilonidal cysct, pilonidal sist
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