i was 40 whan diagnosed in april. i had one lymphnode under my jaw and could not find primary until a petscan found large uptake in oropharynx.i had 30 imrt treatments to primary region and to the node. node did not desolve with rad. so i had a neck dissection one month ago.i also had a tonsilectomy before radiation as all my doctors thought this was the primary.i feel like i came through all this pretty well except for 15lbs. lighter(good thing)and a stiffneck for now.this is a great site for knowledge and support.i pray all will go well for you and your family.ihave a great wife and three small children that have really helped. you will find in the next months how many good people you know that really care about you.to answer your question they will not use imrt if they don't find the primary.i hope they can find it the imrt is very good therapy. good luck and stay positive. mo