A Case of Radiation-induced Multiple Oral Cancer

： A 60-year-old female visited our hospital with pain in the right side of the maxillary alveolus. Seven years before visiting our hospital, she had undergone partial glossectomies and postoperative adjuvant radiotherapy due to squamous cell carcinoma （SCC） of the left margin of the tongue at another hospital. Physical examination at the first presentation revealed tumorous lesions in the right maxilla, left cheek and labial gingiva of the anterior mandible. Biopsies were performed and the pathological diagnoses were SCCs for all biopsies. The patient underwent partial max-illectomy, resection of the buccal tumor, and marginal mandibulectomy simultaneously. The patient died 3 years after the initial treatments because of the uncontrolled primary tumor and lymph node metastases.