Sacral arachnoid diverticula.
Three cases of sacral arachnoid diverticula causing bony erosion are described. Two of these filled with contrast medium after the initial myelogram was completed, and were only apparent on delayed CT.
D001099:Arachnoid / Q000000981:diagnostic imaging*; D004240:Diverticulum / Q000000981:diagnostic imaging*; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D009192:Myelography; D012445:Sacrococcygeal Region; D013126:Spinal Nerve Roots / Q000000981:diagnostic imaging; D014057:Tomography, X-Ray Computed