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Key Points In the previously untreated neck, lymph node infiltration follows a predictable pattern. Except for nasopharyngeal carcinoma, selective irradiation can be applied for patients with an N0 to N1 neck. Three-dimensional (3D) delineation of the neck levels should be…
Key Points Incidence In the United States, nasopharyngeal carcinoma is uncommon, occurring at a rate of less than one case per 100,000 people. In contrast, in southern China and Hong Kong, the incidence is 25 to 50 per 100,000 people…