http://www.burtonreport.com/InfSpine/ArachClassification.htm
Arachnoiditis
Arachnoid Adhesions
Adhesive Arachnoiditis (Focal)
Adhesive Arachnoiditis (Diffuse)
Adhesive Arachnoiditis (Class 1)
Adhesive Arachnoiditis (Class II)
Adhesive Arachnoiditis (Class III)
Arachnoiditis Ossificans