ENT's do have set follow-up exams based on NCCN guidelines, and thier Otololaryncology organization, but scanning is less specific, and in certain H&N cancers, like oropharyngeal, and it's for T3,T4 disease only, as per the NCCN guidelines, minus any suspicion.
Follow-up exam
1st year once every 1-3 months 2nd year once every 2-6 months 3-5 years once every 4-8 months 5 years or more once every 12 months
