Arachnoiditis Ossificans(?)

[Joface]

What can you tell me about the above?  It has been medically established that I have adhesive arachnoiditis in the area of the cauda equina - but during a recent surgery for L4-L5 and L5-S1 decompression, my surgeon noticed that the dura(?) was very hardened in one area, while in another, it appeared quite normal.  A decision was made to open the dura and try to determine a cause for the abnormality.  My neurosurgeon was confronted with a whole lot of calcification embedded with the nerves and  "chipped away" as much of it as possible, before closing the dura and finishing the surgery. The pathology  report indicated that it was just that: calcification.   It wasn't known prior to the lumbar surgery that I had this additional material inside the canal.  I have tried researching this on the internet and all I can find that even slightly resembles the description is something called Arachnoiditis Ossificans.  It must be relatively rare, because I can't seem to locate much information about it.  Is it something that would be hereditary? Does it tend to run only in certain ethnicities or is it found only in certain parts of the world?  Any info or direction you can give me on researching this condition would be appreciated.