I had a follow up CT scan done to check on the status of my fusion ( not fused after 2 1/2 yrs so need 5th sx, 2nd fusion). "Urine Retroperitoneal masses" mentioned on my lumbar CT scan. Anyone heard of this before or had it on their own imaging reports? Sounds ominous and I am still waiting for my NS to get back to my on this matter. Wondering if anyone has any feedback???