In this thesis, the literature on sacro coccygeal pilonidal sinus was revised. The surgical treatment of the chronic and the recurrent sinus with rhomboid excision and rhomboid flap closure technique with its modification was explained and the results of 12 studies using this technique, whether Dufourmentel or the one equivalent to it (Limbergl) , were reported for comparison with a new technique used in this thesis A report on 76 patienls with primary and recurrent chronic sacrococcygeal pilonidal sinus managed by the new kite excision and kite flap closure.