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Endoscopic fenestration of posterior fossa arachnoid cyst for the treatment of presyrinx myelopathy--case report
Authors:Nomura Sadahiro  Akimura Tatsuo  Imoto Hirochika  Nishizaki Takafumi  Suzuki Michiyasu
Institution:Department of Neurosurgery, Yamaguchi University School of Medicine, Ube, Japan. snomura@po.cc.yamaguchi-u.ac.jp
Abstract:A 32-year-old man presented with an arachnoid cyst of the posterior fossa manifesting as cervical syringomyelic myelopathy. Magnetic resonance (MR) imaging demonstrated edematous enlargement and T2 prolongation of the cervical spinal cord, indicating a "presyrinx" state. MR imaging showed the inferior wall of the cyst, which disturbed cerebrospinal fluid (CSF) pulsatile movement between the intraspinal and intracranial subarachnoid spaces. The cyst wall was fenestrated with a neuroendoscope. The presyrinx state and the CSF movement improved. Posterior fossa arachnoid cyst, as well as Chiari malformation, can cause CSF flow disturbance at the craniocervical junction and syringomyelia. Endoscopic fenestration is less invasive than foramen magnum decompression and should be the procedure of choice.
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