Effect of Anti-adhesion Barrier on the Voice Quality After Thyroidectomy.

Inclusion Criteria: * Patients undergoing open thyroidectomy for thyroid cancer * Patients whose tumor size is less than 4cm * Patients who are not suspected of surrounding organ involvement (T4) or metastasis to central lymph nodes in preoperative imaging * Patients with no history of voice-related diseases prior to surgery * Patients with normal movement of both vocal cords in the preoperative vocal cord examination * Patients who consented to the study and obtained consent for the study Exclusion Criteria: * Patients with uncontrolled high blood pressure, diabetes, chronic renal failure, coagulation disease, etc. * History of cardiovascular disease (angina pectoris, heart failure, myocardial infarction, cerebral infarction, cerebral hemorrhage, etc.) * Medical history of drug or substance disorder (alcohol, etc.) * Patients with diseases related to airways, esophagus, and vocal cords (vocal palsy, vocal cord polyps, etc.) * Patients who have already had adhesions in the foreground due to radiation therapy or surgery on the foreground in the past. * Patients with a history of keloid or hypertrophic scars * Patients planning to perform lateral cervical lymph node dissection * Patients with medical thyroid disease, such as Graves' disease and thyroid inflammation in need of treatment * Pregnant or lactating female patients * Other patients who are in charge of clinical trials as unsuitable for participation in the study