Hi Anita,
My husband had his neck dissection on July 31, 2001, Radiation/Chemo finished up Oct 2001 and had his first Head scan ordered by his oncologist (against his ENTs wishes) in Dec 2001 His ENT said with it being so soon after surgery alot of that is scar tissue and a follow up scan that shows something will different will just be healing and not new cancer. He had his first Chest scan 5 months after Rad/Chemo in March 2002
then one August 2002 and again Feb of this year.

Good Luck
Sherrie