İn this article we vvould like to present the early results of 18 cases with different diagnosis that were surgically treated with "egg shell" procedure. Of 18 patients, 5 were female, 13 were male and, the mean age was 32 years with a range of 13-45. İn this series of cases 11 were ankylosing spondylitis, 2 were rheumatoid spondylitis, 3 vjere congenital scoliosis and 1 was trauma and 1 was tumor. This procedure was used for deformity correction, tumor removal and canal decompression.
Keywords: Egg shell procedure, ankylosing spondylitis