Aim: In this study, we aimed to evaluate the effectiveness of surgical treatment in patients diagnosed with thoracic outlet syndrome. Patients and Methods: This study was conducted by analyzing the age, sex, occupational distribution, anamnesis and physical examination findings, symptoms, preoperative examinations, operation findings, postoperative complications, postoperative hospital stay and operation results of thirty seven patients who were diagnosed with Thoracic Outlet Syndrome, and were operated on between 1991 and 2004. Results: Most of the patients were in the 15-35 age group (72.97%) and female (91.9%). Most of these cases were housewives (51.4%). The most common symptoms were pain (94.6%) and numbness (78.4%). The most commonly used test in physical examination was the Adson test, which provided an 86% positive rate. The most common pathology encountered in radiological tests was cervical rib anomaly (37.8%). It was found that EMG of upper extremity supported TOS with a rate of 48.6% and arterial doppler of upper extremity supported TOS with a rate of 13,5%. We applied first rib and cervical rib resection scalenectomy and cutting of fibromuscular bands as a surgery by transaxillary approach. A 78.4% complete recovery was observed in the early period after surgery and there was no mortality in any of the cases. Conclusion: In this study, the results were satisfactory in TOS patients on suitable cases and with good surgical technique. Surgical success rate can reach up to 97%.