First my orthopedic Dr. mentioned something like this, then my neurologist said to remember the name.they then got me a nuclear bone scan.. then 1.5 yrs later a tri. phase bone scan. they used both tests to compare . and they found that my lower right leg was virtually non existent on the triphase test where as a year and a half earlier the found bone bruising, tumors, and multiple pockets of liquid..I cant remember the names of it. that along with numerouse mri,s ct scans, and color changes my orthopedic, neurologist, vascular surgeon, spine specialist gave me a positive dx of RSD/CRPS. the I went to a Pain management Dr. and he did a temperature test of some sort..using a laser machine .. it measured temperature differences in each limb. and he confirmed DX.. now just a couple of months ago. a physical exam done by the Insurance medical examiner re-confirmed a severe case of RSD/CRPS.. you can be sure that the insurance company was not happy with that ..