I had a ct/myelogram done recently and the person who read the report said there's a possibility of arachnoiditis. I had clumped nerves at L2, L3 & L4. I thought this odd since my surgery was done on L5-S1 and I've learned that arachnoiditis can be caused by surgery. Does anyone know more about this condition? Can this begin above the surgery site? Or does it begin right at the surgery site? Can it show up years after the spinal cord or roots are damaged? Like 10 - 20 years later? Just searching for answers.