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- W2335192134 abstract "Formation of the caudal spinal cord in vertebrates is by secondary neurulation, which begins with mesenchyme-epithelium transformation within a pluripotential blastema called the tail bud or caudal cell mass, from thence initiating an event sequence proceeding from the condensation of mesenchyme into a solid medullary cord, intrachordal lumen formation, to eventual partial degeneration of the cavitatory medullary cord until, in human and tailless mammals, only the conus and filum remain.We describe a secondary neurulation malformation probably representing an undegenerated medullary cord that causes tethered cord symptoms.We present 7 patients with a robust elongated neural structure continuous from the conus and extending to the dural cul-de-sac, complete with issuing nerve roots, which, except in 2 infants, produced neurological deficits by tethering.Intraoperative motor root and direct cord stimulation indicated that a large portion of this stout neural structure was redundant nonfunctional spinal cord below the true conus. Histopathology of the redundant cord resected at surgery showed a glioneuronal core with ependyma-lined lumen, nerve roots, and dorsal root ganglia, corroborating the picture of a blighted spinal cord.We propose that these redundant spinal cords are portions of the medullary cord normally destined to regress but are here retained because of late arrest of secondary neurulation before the degenerative phase. Because programmed cell death almost certainly plays a central role during degeneration, defective apoptosis may be the underlying mechanism." @default.
- W2335192134 created "2016-06-24" @default.
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- W2335192134 date "2011-06-01" @default.
- W2335192134 modified "2023-10-06" @default.
- W2335192134 title "Retained Medullary Cord in Humans: Late Arrest of Secondary Neurulation" @default.
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- W2335192134 doi "https://doi.org/10.1227/neu.0b013e31820ee282" @default.
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