Aim: We could not find a study in the literature based on physical examination findings, ultrasonography (USG) and magnetic resonance imaging (MRI) in the treatment of pilonidal sinus. In this study, we aimed to accomplish a classification based on clinical findings, ultrasonographic and magnetic resonance to provide objective criteria for diagnosis, treatment, and recurrence follow-up of pilonidal sinus.Method: This study included patients who presented to Necmettin Erbakan University Meram Medical Faculty, the clinic of general surgery and were diagnosed with pilonidal sinus disease between 2015 and 2016. After receiving medical history, physical examination was carried out. Then MRI and USG of the patients were ordered, and the relationship of pilonidal sinus with skin, subcutaneous tissues and surrounding were recorded and analyzed. Patients were categorized as 3 groups based on average of the sum of depth and width on MRI and USG imaging. Patients with acute abscess considered as stage 2 according to the navicular region classification were not categorized.Results: Patients were divided into three groups according to average of the sum of width and depth on USG. It was found that duration of hospitalization, work absence and frequency of operation increased as the mean values increased. Status of being operated was statistically significantly different (p=0.007). Conclusion: Patients with average of the sum of width and depth on MRI and USG;Stage 1: <15 mm.Stage 2: 15-30 mm.Stage 3: >30 mm.In conclusion; we obtained a significant classification based on MRI and USG. We concluded that informing the patients classified according to MRI and USG on treatment procedure would be meaningful. This study will guide further studies to be conducted with a larger number of patients.