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Journal of Korean Neurosurgical Society 2002;31(4): 399-402.
A Case of The Surgically Treated Intraspinal Extradural Meningeal Cyst Demonstrating 'Ball-Valve' Mechanism of Formation.
Young Jin Song, Hyung Dong Kim, Hyun Chul Shin, Oon Ki Baek
Department of Neurosurgery, College of Medicine, Dong-A University, Busan, Korea.
ABSTRACT
The intraspinal extradural meningeal cyst is a rare cause of compression of spinal cord. The most common clinical presentation is a slowly progressive myelopathy, but our case was presented with polyradiculopathy at admission. The authors believe that our case is particularly attributable to a ball-valve mechanism involving an idiopathic dural rent and a herniated segment of an underlying dorsal rootlet in the operative finding. As in our case, magnetic resonance imaging provides accurate diagnosis to identify an intraspinal extradural meningeal cyst. Closure of dural rent with marsupialization of the meningeal cyst through minimal laminectomy can be successfully managed with favorable clinical outcome as in our case.
Key Words: Intraspinal extradural meningeal cyst; Ball-Valve mechanism; Dural rent; Marsupialization; Microinvasive laminectomy
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