KMID : 1001920200630030314
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Journal of Korean Neurosurgical Society 2020 Volume.63 No. 3 p.314 ~ p.320
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Secondary Neurulation Defects-1 : Retained Medullary Cord
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Kim Kyung-Hyun
Lee Ji-Yeoun Wang Kyu-Chang
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Abstract
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Retained medullary cord (RMC) is a relatively recent term. Pang et al. newly defined the RMC as a late arrest of secondary neurulation leaving a non-functional vestigial portion at the tip of the conus medullaris. RMC, which belongs to the category of closed spinal dysraphism, is a cord-like structure that is elongated from the conus toward the cul-de-sac. Because intraoperative electrophysiological confirmation of a non-functional conus is essential for the diagnosis of RMC, only a tentative or an assumptive diagnosis is possible before surgery or in cases of limited surgical exposure. We suggest the term ¡®possible RMC¡¯ for these cases. An RMC may cause tethered cord syndrome and thus requires surgery. This article reviews the literature to elucidate the pathoembryogenesis, clinical significance and treatment of RMCs.
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KEYWORD
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Secondary neurulation, Conus medullaris, Intraoperative electrophysiological monitoring, Closed spinal dysraphism, Tethered cord syndrome
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