Hi - you need to know if it was gone (at least on the scan) at the end of your treatment. There is no such thing as nearly non existent. With Cancer it's either there or it's not. And if it's there it needs to be dealt with. Period.

I would ask for clarification. No Dr. can tell you if you are cancer free as not everything shows up on a scan. But if you have a scan that offers up any questions as to whether the treatment was effective and if there is still something of concern there then you need to know what it is (via biopsy) so you can either have it removed or follow up with other treatment.

Hugs and best of luck.