text: what is arachroiditis?   if you mean arachnoiditis, then this is the report according to webmd:  arachnoiditis is a general term for several progressive regional disorders all of which result in the inflammation of parts of the middle membrane surrounding the spinal cord and brain (arachnoid membrane) and the space defined by this membrane (subarachnoid space). either the spinal cord or the brain may be involved; in some cases, both are affected. this disorder can also be associated with meningitis. the condition may be caused by foreign agents such as anesthesia drugs or testing dyes injected into the spine or arachnoid membrane.