I believe that the 2 year mark is significant because if a recurrence was to occur, in the original tumor bed, statistically it would be in the first 2 years (95% I believe - 80% year one and 15% year 2). At 2 years I began to worry more about locoregional and distant metastesis and wanted more scrutiny in areas other the H&N. Unfortunately there are no NCCN guidelines for followup for locoregaional or distant mestastis screening. This affects what insurance companies are willing to pay for what and HMO's are willing to do. There are exceptions - some doctors will order them, espcially the PET or PET/CT. Most likely it will be your MO or RO and most ENT's or H&N surgeons don't prefer scans.