RecruitingPhase 2Radiation therapyLymphoscintigraphy Directed Elective Neck Radiation for p16+ Favorable Risk Oropharynx CancerThis is a prospective, phase II, stratified single arm investigation for favorable prognosis in p16+ oropharynx cancer patients with either node negative or malignant neck adenopathy with lymphoscintigraphy mapping confined to the ipsilateral neck.