الفهرس 
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Abstract
Pilonidal sinus is an infectious and inflammatory disease of sacrococcygeal region, which is generally observed in young people; especially in males. The disease usually presents as a chronically discharging sinus tract or an abscess. Risk factors include adiposity, sedentary lifestyle, local irritation-trauma, insufficient body hygiene, excessive hair. Regardless of the mode of presentation, the disease causes significant morbidity by disturbing the quality of life. However, the treatment of pilonidal disease has been the subject of debate for many years. The main principles in the treatment of PNS are the simple and easy application of the method to be selected, the short duration of hospital stay, low level of postoperative wound care and pain, low recurrence rates, and quick return to daily activities. The study is aimed to compare crystallized phenol application versus excision and primary closure in the treatment of PNS as regard healing time, postoperative pain and recurrence rate, intra and postoperative complications and return to normal activity. This study is a prospective cohort study that was carried out on 20 patients diagnosed with sacrococcygeal pilonidal sinus disease were included in the current study. They were divide into two groups : • The crystallized phenol group: which included 9 patients who were managed by crystallized phenol application. • The excision and primary closure group: which included the remaining 11 cases who were managed by primary excision and repair. The main results of the study revealed that : The mean age of the included cases was 23.44 and 25.82 years in the phenol and excision groups respectively. Male patients represented 77.8% and 63.6% of the included patients in the same groups respectively, whereas the remaining patients were females. In addition, BMI had mean values of 24.76 and 26.91 kg/m2 in the study groups respectively. All of the previous variables were statistically comparable between 2 study groups (p > 0.05). >There was no significant difference was noted between the two groups regarding patient’s complaint (p = 0.648). Discharge was the commonest reported complaint, as it was reported by 88.9% and 81.8% of patients in the phenol and excision groups respectively. Pruritis was experienced only by one case in each group, while one patient in the excision group (9.1%) reported perianal pain. The duration of patient complaint had mean values of 14.67 and 15.27 months in the same groups respectively, with no significant difference between the two groups (p = 0.606). Conclusion : No difference was observed in terms of recurrence and complication rates in the comparison of PNS phenol treatment with excision and primary repair in of adolescent age group. However, phenol treatment seems to be a suitable treatment option for pilonidal sinus disease due to its many advantages such as being simple, minimally invasive, less painful, and simply applied under local anesthesia. In addition, phenol administration does not cause any disadvantage for advanced surgery, and pilonidal sinus patients in the adolescent age group should be given this treatment option.