Yes and No. For my primary in the tonsil, which initially came back with BOT, Valleculla involvement, bilateral lymph nodes too, I had radiation to the primary, oropharynx atea, bilateral lymph nodes, basically from the nose down to the clavicle on both sides. For my recurrences, only the primary areas were radiated. Oral cancer is different than oropharynx. Usually surgery is the mainstay for oral cancer treatment, possibly with radiation, chemoradiation for larger T, and N disease, negative prognostic factors, which surgery you had. The oropharynx it's usually chemoradiation, but this area metastasizes quickly to to the lymph nodes due to the deep structure of the BOT, and Lymphoid's. I guess after the tongue resection, neck dissection, they feel they can eradicate any remaining cancer cells in the tongue. If cancer was to return, it's often at the surgical lines.