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Abstract
A pilonidal sinus is a cavity in the subcutaneous tissue which is lined by granulation tissue, generally contains hair and communicates with the surface by a track which is usually lined
by squamous epithelium continuous with epidermis.
The pilonidal sinus disease includes various clinical phenomena which occur in skin and subcutaneous tissue of
presacral region. The ateiological theories of pilonidal sinus is:
(1) Congenital theory:
Sequestration dermoid cyst getting infected and ruptured
leading to a sinus. This is no longer accepted since it does not date since birth is not proceeded by a cysts and is not lined with epithelium.
(2) Acquired theory:
The most accepted, it is an inclusion of loose hairs under the skin due to continous friction and negative pressure of the area may such other hairs into the sinus.
Pilonidal sinus occurs in young male more than female and in hirsute people than blond one.
This condition increases during second world war in many individuals who traveling in jeeps led some writers to
refer to pilonidal sinus as a jeep disease.