Were your MRI's performed without & with contrast? If not, it is very likely that the mylogram can reveal details not seen on the other tests.

Also, I have the following link that may be helpful in informing you about what the difference in a CT, MRI, & CT Myelogram.

http://www.mayoclinic.com/health/spi...-and-diagnosis

I had a myelogram before having surgery in 2003 (cervical fusion C5-C7). As with all invasive procedures, there are risks involved; but mine went off without a hitch. The only thing that I would caution you is to be sure to follow instructions so as not to increase your chances of developing a crushing headache after the test.

Best regards,

EJ