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The treatment of pilodinal sinus (P.S.), a frequent disease, represents for the surgeon a not simple problem because of post-surgery complications and high recurrence rates. The P.S. is the more frequent lesion of sacrococcygeal region in young grownups, specially between II and III decade of age with more incidence in the male sex (1,1%) than female sex (0,11%) (1, 2). About etiology, until now not clear, assumes more credit the hypothesis of an acquired mechanism than congenital, in accord to our anatomo-pathology results that prove the first (3, 4, 5, 6).