Addiction to cortisone was the subject of the 1956 motion picture, Bigger Than Life , produced by and starring James Mason . Though it was a box-office flop upon its initial release,  many modern critics hail it as a masterpiece and brilliant indictment of contemporary attitudes towards mental illness and addiction.  In 1963, Jean-Luc Godard named it one of the ten best American sound films ever made.  John F. Kennedy needed to regularly use corticosteroids such as cortisone as a treatment for Addison's disease . 
Thank you for a very well presented procedure and images. Believe it or not, where I’m working now, we have no fluoro. We have CT and US. Have done these in the past going just under the inferior rim of the coccyx with fluoro as was suggested in another comment. Will give it a go with CT as I feel going through the ligament, as you suggest, is probably more controlled and possibly better tolerated. I wouldn’t feel comfortable using US to get the ganglion as the bone would block visualization. If I just wanted a joint injection at the sc joint, then I could use US… Also, a short block scan of the coccyx region with ct will give me a lot of information about other things that may be going on such as Tarlov cysts, mets, etc.
Ketamine infusion therapy, while rarely performed, can be very effective in treating neuropathic pain which is resistant to other treatments. It is most commonly used for pain from RSD or CRPS (chronic regional pain syndrome). It is also used in fibromyalgia, phantom limb pain, and postherpetic neuralgia. In part, Ketamine infusion works on receptors in the central nervous system to reduce sensitivity to pain. Francis Corrigan, . has the experience to confidently provide this advanced pain management technique for the rare patient who does not respond to other treatments. Dr. Corrigan is currently the only Pain Management doctor providing this treatment in the Raleigh, Durham and Cary marketplace. He has successfully treated patients in Pinehurst for several years with this advanced treatment option.