You have the flouroscopy done interoperatively that will provide the epidurogram (assuming there is extravasation of the contrast).
CT contains a lot of info about tissues that are not as visible on MRI, but you can do a CT anytime if it is deemed necessary. The advantage of the post-disco CT is the image of the dispersion of the contrast, and you get that with the flouroscopy.
All the usual "I'm not a doctor" disclaimer applies here. Perhaps someone paindoc will come along and shed some more light here?
Mark
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