Rahimizadeh A, Williamson W, Malekmohammadi Z, Rahimizadeh S, Amirzadeh M, Homae M et al . Thoracolumbar Extradural Arachnoid Cysts: Report of Two Adult Cases. Iran J Neurosurg 2024; 10 : 17
URL:
http://irjns.org/article-1-431-en.html
1- Pars Advanced and Minimally Invasive Medical Manners Research Center, Iran University of Medical Sciences, Tehran, Iran
2- The Office of Clinical Research (OCR), Baylor College of Medicine, Houston, USA. , walter.williamson@bcm.edu
3- Pars Advanced and Minimally Invasive Medical Manners Research Center, Iran University of Medical Sciences, Tehran, Iran.
4- Anderson Cancer Research Center, University of Texas, USA.
5- Department of Pathology, Sina Hospital, Tehran University of Medical Sciences, Tehran, Iran.
Abstract: (268 Views)
Background and Importance: Extradural spinal arachnoid cysts are a rare compressive pathology of the spinal cord. They are believed to arise from congenital defects in the dura mater, with gradual enlargement occurring over time. The mainstay of treatment for spinal extradural arachnoid cysts consists of closing the minute dural defect or ostia through which the arachnoid layer has subsequently herniated. Exposure and ligation of the fistula tract at the ostia can then be achieved by utilizing either multilevel or single level laminectomy.
Case Presentation: Two cases are presented herein that exhibited progressive weakness of the lower limbs. Magnetic resonance imaging in both patients displayed an extradural cystic mass at the thoracolumbar spine compatible with an extradural arachnoid cyst. In each case, following surgical excision of the arachnoid cyst, the corresponding ostia or tiny dural defect was securely
closed with silk sutures. Postoperatively, neither patient reported any issues related to recovery during a six-month follow-up encounter.
Conclusion: Extradural arachnoid cysts are rare, benign, but potentially debilitating causes of spinal cord compressions. The mainstay of treatment is the closure of the dural defect or ostia. If the radiological localization of the ostia can be identified preoperatively, selective closure of the ostia using a minimally invasive surgical procedure is the intervention of choice. Otherwise, closure of the dural defect will be possible following a multilevel laminectomy and total resection of the arachnoid cyst.
Article number: 17
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- Spinal arachnoid cysts are uncommon, accounting for about 1% of all primary benign spinal compressive pathologies.
- The pathogenesis of extradural arachnoid cysts involves herniation of the arachnoid layer into the extradural space through a tiny dural defect.
- Extradural arachnoid cysts may remain asymptomatic for a long period, and surgical intervention is indicated only in symptomatic cases.
- The mainstay of treatment for symptomatic cases remains the closure of the ostia with interrupted silk sutures or by using silver clips.
- The majority of patients undergoing surgery will experience sustained improvement in their neurological function, but long-term clinical and radiological follow-up will be mandatory.