RT Journal Article SR Electronic T1 Diastematomyelia: hemicord and meningeal sheaths; single and double arachnoid and dural tubes. JF American Journal of Neuroradiology JO Am. J. Neuroradiol. FD American Society of Neuroradiology SP 633 OP 636 VO 4 IS 3 A1 Naidich, T P A1 Harwood-Nash, D C YR 1983 UL http://www.ajnr.org/content/4/3/633.abstract AB 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.