Ganglion cysts are common. But surgery is always bad for rsd especially if the surgery is in the affected limb. Ketamine infusions can help tremendously with trying to combat spreading of rsd . I know vitamin c or d as well as low dose naltrexone can help with combatting spreading as well. I would like you to be aware durcums disease or syndrome is much more common in rsd patients but is very hard to diagnose. But can be mistaken for cysts i am neither obese or over 18 and have it. Although it talk about durcums and obesity and older age in it description you down necessarily have to have either.