I have had a couple of Myleograms done. It is worth it to get a good ideal of what is going on in your spine. Having said that, I will tell you it is very uncomfortable. They basically inject your spine with a dye, and put you on a tilt table. They will tilt your head down or up depending on where they need to get a image. Mine was in my Cerivcal spine, so they had to tilt me head down. I just remember feeling so much pressure. I don't want to scare you, it is not unbearable and your doc must have his reasons for wanting this type of imaging.