My daughter just had her PET scan on Wednesday and her doctor called today saying that there is a very very small spot on her neck. He said she would not feel it because it is too small. He ordered a CT which she had done today (no results). He said he didn't know what it was. Has anything like this ever happened to anyone? I thought that the PET scan would tell if there was any active cancer cells. If I am right thinking this, why would he be saying that he isn't sure what it is, and order a CT scan. She has finished 8 rounds of ABVD (March 17). I am very worried.