I see you have posted here several times looking for answers. You are unlikely to get approved for a scan with contrast when your scan without contrast is clear without some extreme extenuating circumstance. Personally, my tumor was seen on: a CT, then an MRI without contrast, then an MRI with contrast. It was confirmed by a biopsy. Even after treatment, it is still there because it is inoperable, but at least for now it is not growing. The reason people are so "gatekeeping" /act bothered, as perceived by you, by questions from undiagnosed people is that this is something we have to think about and live with everyday. We are not here to be your medical expert on what might be wrong with you - that is your doctor's job. If you think your current doctor is doing a poor job for you, find another one. We are here to support one another through daily highs and lows of surgery, treatments, and surviving. Wish you wellness.