Dear JHagopian, good to see you again and I am curious where you are being treated. Ah, well meaning friends who are not knowledgable about CC. When Teddy was going through all this he had PET Scans every 6 months with monthly visits to the ONC with LABS. That is how they kept watch. From what I understand a PET shows ‘hot’ spots whereas an MRI shows that spot with more definition. I can only go with how they watched Teddy. It sounds like you are doing very well what kind of treatment have they given you? Now, I am curious as to why an MRI and a CAT scan? I hope you are not nervous about this site, it is a wonderful Board and welcome back.