Diastematomyelia is a rare form of spinal dysraphism characterized by a sagittal cleft of varying extent in the spinal cord, conus medullaris or filum terminale with splaying of the posterior vertebral elements. This condition results from the presence of an osseous, cartilaginous or fibrous septum producing a complete or incomplete sagittal division of the spinal cord into two hemicords. It may be isolated or associated with other segmental anomalies of the vertebral bodies.
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