Because no case of high-grade dysplasia or invasive carcinoma was found in this study after a mean follow-up of 30 years, we conclude that it is very unlikely for invasive carcinoma to be a complication in ileal pouch mucosa.

Sacrococcygeal pilonidal disease is a common and well recognized entity. For many years the cause of sacrococcygeal pilonidal sinus has been matter of debate. When the treatment is considered, there was a frequent lack of success of the surgical methods of excision regarding morbidity, healing, recurrence and cure. All these factors rendered the acquired thesis of pilonidal sinus disease to be more accepted. In dealing with the pathogenesis of pilonidal sinus disease, Karydakis attributed the hair insertion process to three main factors: the invader, i.e. the loose hair; the force, which causes the insertion; and the vulnerability of the skin to the insertion of hair at the depth of the natal cleft. The sinus is initiated from a small midline opening lined by stratified squamous epithelium. Additional sinuses are frequent and have lateral openings. Malignant transformation is rare but cases of squamous cell carcinoma and verrucous carcinoma have been reported. Pilonidal sinus disease consists in a symptoms complex with presentations ranging from asymptomatic pits to painful draining lesions that are predominantly located in the sacrococcygeal region. Asymptomatic pits do not require treatment. Options for treatment of acute abscess include aspiration, drainage without curettage, and drainage with curettage. The choice of a particular surgical approach depends on the surgeon's familiarity with the procedure and perceived result in terms of low recurrence of sinus and a quick healing of resulting cavity or surgical wound. Conservative nonoperative management, closed methods, laying of track, wide excision and open drainage, wide excision and primary closure, and limited excision are the methods currently used. From the profusion of studies, it is apparent that various methods are being tried and no one method is universally acceptable. Recurrence rates vary with the technique, operator and length of follow-up. Primary closure with a lateral approach appears to give the best results.

Our results suggest that PNS can be successfully treated by our hitherto undescribed method, patients can be discharged early and there is very low recurrence rate.