The Experts below are selected from a list of 6366 Experts worldwide ranked by ideXlab platform
Marion L Walker - One of the best experts on this subject based on the ideXlab platform.
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noncommunicating spinal extradural Arachnoid cyst causing spinal cord compression in a child
Journal of Neurosurgery, 2005Co-Authors: James K Liu, John R W Kestle, Chad D Cole, Gregory T Sherr, Marion L WalkerAbstract:Extradural Arachnoid cysts in the spine are relatively uncommon causes of spinal cord compression in the pediatric population that are thought to arise from congenital defects in the dura mater. Most reports describe such cysts communicating with the intrathecal subArachnoid space through a small defect in the dura. The authors describe the case of a child who presented with spinal cord compression caused by a large spinal extradural Arachnoid cyst that did not communicate with the intradural subArachnoid space. An 11-year-old girl presented with urinary urgency, progressive lower-extremity weakness, myelopathy, and severe gait ataxia. Magnetic resonance imaging of the spine demonstrated a large extradural Arachnoid cyst extending from T-8 to T-12. The patient underwent a thoracic laminoplasty for en bloc resection of the spinal extradural Arachnoid cyst. Intraoperatively, the dura was intact and there was no evidence of communication into the intradural subArachnoid space. Postoperatively, the patient's motor strength and ambulation improved immediately, and no subsequent cerebrospinal fluid leak occurred. Noncommunicating spinal extradural Arachnoid cysts are extremely rare lesions that can cause spinal cord compression in children. Because the dura remains intact, they can be removed entirely without subsequent dural repair. The authors review the literature and discuss the proposed underlying mechanisms of formation of these Arachnoid cysts.
Toru Matsui - One of the best experts on this subject based on the ideXlab platform.
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dorsal spinal Arachnoid web diagnosed with the quantitative measurement of cerebrospinal fluid flow on magnetic resonance imaging
Journal of Neurosurgery, 2014Co-Authors: Han Soo Chang, Atsushi Nagai, Soichi Oya, Toru MatsuiAbstract:An Arachnoid web is an abnormal formation of the Arachnoid membrane in the spinal subArachnoid space that blocks CSF flow and causes syringomyelia. Although the precise mechanism of syrinx formation is unknown, dissection of the Arachnoid web shrinks the syrinx and improves symptoms. Precisely determining the location of the Arachnoid web is difficult preoperatively, however, because the fine structure generally cannot be visualized in usual MRI sequences. In this report the authors describe 2 cases of Arachnoid web in which the web was preoperatively identified using quantitative CSF flow analysis of MRI. By analyzing cardiac-gated phase-contrast cine-mode MRI in multiple axial planes, the authors precisely localized the obstruction of CSF flow on the dorsal side of the spinal cord in both patients. This technique also revealed a 1-way valve-like function of the Arachnoid webs. Imaging led to the early diagnosis of myelopathy related to the derangement of CSF flow and allowed the authors to successfully ...
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dorsal spinal Arachnoid web diagnosed with the quantitative measurement of cerebrospinal fluid flow on magnetic resonance imaging
Journal of Neurosurgery, 2014Co-Authors: Han Soo Chang, Atsushi Nagai, Soichi Oya, Toru MatsuiAbstract:An Arachnoid web is an abnormal formation of the Arachnoid membrane in the spinal subArachnoid space that blocks CSF flow and causes syringomyelia. Although the precise mechanism of syrinx formation is unknown, dissection of the Arachnoid web shrinks the syrinx and improves symptoms. Precisely determining the location of the Arachnoid web is difficult preoperatively, however, because the fine structure generally cannot be visualized in usual MRI sequences. In this report the authors describe 2 cases of Arachnoid web in which the web was preoperatively identified using quantitative CSF flow analysis of MRI. By analyzing cardiac-gated phase-contrast cine-mode MRI in multiple axial planes, the authors precisely localized the obstruction of CSF flow on the dorsal side of the spinal cord in both patients. This technique also revealed a 1-way valve-like function of the Arachnoid webs. Imaging led to the early diagnosis of myelopathy related to the derangement of CSF flow and allowed the authors to successfully excise the webs through limited surgical exposure.
John R W Kestle - One of the best experts on this subject based on the ideXlab platform.
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risk factors for pediatric Arachnoid cyst rupture hemorrhage a case control study
Neurosurgery, 2013Co-Authors: Marshall C Cress, John R W Kestle, Richard Holubkov, Jay RivacambrinAbstract:BACKGROUND As the availability of imaging modalities has increased, the finding of Arachnoid cysts has become common. Accurate patient counseling regarding physical activity or risk factors for cyst rupture or hemorrhage has been hampered by the lack of definitive association studies. OBJECTIVE This case-control study evaluated factors that are associated with Arachnoid cyst rupture (intracystic hemorrhage, adjacent subdural hematoma, or adjacent subdural hygroma) in pediatric patients with previously asymptomatic Arachnoid cysts. METHODS Patients with Arachnoid cysts and intracystic hemorrhage, adjacent subdural hygroma, or adjacent subdural hematoma treated at a single institution from 2005 to 2010 were retrospectively identified. Two unruptured/nonhemorrhagic controls were matched to each case based on patient age, sex, anatomical cyst location, and side. Risk factors evaluated included Arachnoid cyst size, recent history of head trauma, and altitude at residence. RESULTS The proportion of imaged Arachnoid cysts that presented either originally or subsequently with a rupture or hemorrhage was 6.0%. Larger cyst size, as defined by maximal cyst diameter, was significantly associated with cyst rupture/hemorrhage (P < .001). When dichotomized with a 5-cm cutoff, 9/13 larger cysts ruptured and/or hemorrhaged, whereas only 5/29 smaller cysts ruptured/hemorrhaged (odds ratio = 16.5 (confidence interval [2.5, ∞]). A recent history of head trauma was also significantly associated with the outcome (P < .001; odds ratio = 25.1 (confidence interval [4.0, ∞]). Altitude was not associated with Arachnoid cyst rupture or hemorrhage. CONCLUSION This case-control study suggests that larger Arachnoid cyst size and recent head trauma are risk factors for symptomatic Arachnoid cyst rupture/hemorrhage.
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noncommunicating spinal extradural Arachnoid cyst causing spinal cord compression in a child
Journal of Neurosurgery, 2005Co-Authors: James K Liu, John R W Kestle, Chad D Cole, Gregory T Sherr, Marion L WalkerAbstract:Extradural Arachnoid cysts in the spine are relatively uncommon causes of spinal cord compression in the pediatric population that are thought to arise from congenital defects in the dura mater. Most reports describe such cysts communicating with the intrathecal subArachnoid space through a small defect in the dura. The authors describe the case of a child who presented with spinal cord compression caused by a large spinal extradural Arachnoid cyst that did not communicate with the intradural subArachnoid space. An 11-year-old girl presented with urinary urgency, progressive lower-extremity weakness, myelopathy, and severe gait ataxia. Magnetic resonance imaging of the spine demonstrated a large extradural Arachnoid cyst extending from T-8 to T-12. The patient underwent a thoracic laminoplasty for en bloc resection of the spinal extradural Arachnoid cyst. Intraoperatively, the dura was intact and there was no evidence of communication into the intradural subArachnoid space. Postoperatively, the patient's motor strength and ambulation improved immediately, and no subsequent cerebrospinal fluid leak occurred. Noncommunicating spinal extradural Arachnoid cysts are extremely rare lesions that can cause spinal cord compression in children. Because the dura remains intact, they can be removed entirely without subsequent dural repair. The authors review the literature and discuss the proposed underlying mechanisms of formation of these Arachnoid cysts.
Brian J Dlouhy - One of the best experts on this subject based on the ideXlab platform.
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symptomatic spinal extradural Arachnoid cyst with cord compression in a family case report
Journal of Neurosurgery, 2017Co-Authors: Arnold H Menezes, Patrick W Hitchon, Brian J DlouhyAbstract:A family with familial spinal extradural Arachnoid cyst is presented. A 14-year-old boy had an extensive T-8 through L-2 dorsal extradural Arachnoid cyst with spinal cord compression and slowly progressive myelopathy. His mother had presented 4 years earlier with acute excruciating back pain due to the combination of a lumbar extradural Arachnoid cyst at L2-4 and an extruded disc at L3-4. The literature is reviewed in light of the pathogenesis, imaging, and surgical technique required for treatment.
Naresh P Patel - One of the best experts on this subject based on the ideXlab platform.
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iatrogenic intradural spinal Arachnoid cyst as a complication of lumbar spine surgery
Journal of Neurosurgery, 2009Co-Authors: Eric W Nottmeier, Robert E Wharen, Naresh P PatelAbstract:Iatrogenic spinal Arachnoid cysts are rare, but have been described as a complication of spinal injection and lumbar puncture procedures. The authors describe 2 cases of iatrogenic spinal Arachnoid cyst formation that occurred after incidental durotomy during lumbar spine surgery. In both cases, postoperative MR imaging revealed compression of the cauda equina by an intradural Arachnoid cyst. Intradural exploration and fenestration of the Arachnoid cyst was accomplished in each case. This entity should be considered in the differential diagnosis of a patient experiencing symptoms of neurological compression after a lumbar surgery complicated by incidental durotomy.