,PATHOLOGICAL FINDINGS:,  Dr. X made the approach and once we were at the L5-S1 disk space, we removed the disk and we placed a 13-mm PEEK vertebral spacer filled with a core of bone taken from the L5 vertebral body. 
,PATHOLOGICAL FINDINGS : , Dr. X made the approach and once we were at the L5 - S1 disk space , we removed the disk and we placed a 13 - mm PEEK vertebral spacer filled with a core of bone taken from the L5 vertebral body .