Plasma Radiofrequency Ablation at Low Temperature Versus Electrocautery Block Resection at High Frequency for Localized Recurrent Nasopharyngeal Carcinoma

Inclusion Criteria: 1. At least 6 months disease free interval (defined as duration between the initial course of radiotherapy and recurrence) 2. Histopathologically diagnosed with undifferentiated or differentiated, nonkeratinizing nasopharyngeal carcinoma. 3. Resectable recurrent nasopharyngeal carcinoma: rT1-3N0-3M0 A) The tumor is confined to the nasopharyngeal mucosa, or the surface of the parapharyngeal space, or the bottom wall of the sphenoid sinus, and is more than 0.5cm away from the internal carotid artery B) The cervical lymph node lesions do not infiltrate the cervical spine, brachial plexus, cervical muscles, and internal carotid artery. 4. Age: 18-70 years old. 5. Subjects must sign an informed consent form. Exclusion Criteria: 1. Karnofsky score (KPS)≤70. 2. Has known Subjects with other malignant tumors. 3. Has seriously mental disease. 4. Uncontrolled clinically significant heart disease and Pulmonary dysfunction. 5. Pregnancy or breast feeding.