I have had a headache for about 3 weeks. It has ranged from mild to fairly severe. At its worst I went to the ER. At the ER I had a routine CT scan that showed a possible blood clot. The CT scan was followed immediately by an MRI which showed everything as normal. I was treated for a migraine and sent home. I saw my primary doc 2 days later who confirmed that I probably had a migraine, but ordered another MRI with contrast, to ease my mind. The MRI that was conducted did not involve any dye. I was told that the computer hardware and software provided sufficient detail of the cerebral vascular system to not warrant a dye study. The next day my doc called and said there was a mass 10 mm X 7 mm in the right suprasellar cistern, and that an additional MRI was needed to determine the cause. One hour prior to the final MRI my doc called and said the radiologist had contacted her and that after looking at the images from the ER and comparing to the new MRI he believed the image to be an artifact. I had the more focused MRI done anyway and the radiologist said everything was fine. Should I believe them? Should additional imaging, or other testing be done? I still have a headache, now going on 3 weeks but not as bad.