Diastematomyelia: hemicord and meningeal sheaths; single and double arachnoid and dural tubes.
Metrizamide computed tomographic myelography demonstrates well: partial- and full-thickness diastematomyelia; the presence, shape, and (a)symmetry of the two hemicords; focal persistence of two anterior spinal arteries, one supplying each hemicord; the single or double subarachnoid space(s), arachnoid tubes, and dural tubes which encompass the hemicords; the dural septum formed by the medial walls of the two dural tubes; the dural cleft situated between the two walls of the dural septum; the bone spur within the dural cleft; and the presence of any tethering dorsal fibrous bands or aberrant dorsal nerve roots.
D001099:Arachnoid / Q000000981:diagnostic imaging; D002648:Child; D002675:Child, Preschool; D004388:Dura Mater / Q000000981:diagnostic imaging; D005260:Female; D006801:Humans; D008297:Male; D008578:Meninges / Q000000981:diagnostic imaging; D009192:Myelography / Q000379:methods*; D009436:Neural Tube Defects / Q000000981:diagnostic imaging*; D013126:Spinal Nerve Roots / Q000002:abnormalities / Q000000981:diagnostic imaging; D014057:Tomography, X-Ray Computed / Q000379:methods*