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MRI through the lower spinal cord demonstrates an uneven split from T9 to L1. The dura appears to be a single sac without a dividing septum/spur. Above the split the lower thoracic cord demonstrates hydromyelia. L1 and possibly L2 (incomplete images) appear to have unfused lamina (spina bifida).
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This case illustrates the less classical type of split cord malformation (type II) in which the dura is single and no bony septum is present.