One of my doctors has asked me to get a discogram since my MRI and myelogram didn't show enough. Has anyone had this done? And do you know if this would show a disc fragment that's separated from the actual disc? My doctor said something about a disc fragment hiding under the S1 nerve root. But he still wants more tests to be sure. I understood that a discogram would only show the outline of the original disc, not any fragments that are separated. If anyone has info on this, please let me know. Thanks.