Definitive diagnosis requires myelography, computed tomography (CT) scans or magnetic resonance imaging (MRI). (glenerinanimalhospital.com)
It is essential that a spinal cord injury be diagnosed as soon as possible through an MRI or CT myelography. (cprlaw.com)
Without examining Bell and seeing some x-rays (possibly myelography) I can not say what the specific cause is; if you are seeing no improvement you should return to your Veterinarian for an examination (or visit another Veterinarian) to determine if there is another cause of the symptoms she is displaying. (wagwalking.com)