AJNR. American journal of neuroradiology
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AJNR Am J Neuroradiol · Jan 1996
Case ReportsPleomorphic xanthoastrocytoma presenting with massive intracranial hemorrhage.
A 46-year-old woman presented with massive left temporal lobe intraparenchymal and diffuse subarachnoid hemorrhage on CT. Lack of enhancement excluded intermediate and high-grade primary tumor or metastasis as likely causes. At surgery, a fibrovascular left temporal lobe mass adherent to the dura proved to be a pleomorphic xanthoastrocytoma. The unusual hemorrhagic presentation of this typically benign entity is thought to be related to the meningeal involvement, which itself is characteristic of this neoplasm.
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AJNR Am J Neuroradiol · Nov 1995
Spinal dural arteriovenous fistulas: evaluation with MR angiography.
To show that postgadolinium three-dimensional time-of-flight MR angiography shows abnormal intradural vessels associated with spinal dural arteriovenous fistula better than routine MR imaging and provides screening information useful for subsequent diagnostic conventional angiography and/or posttreatment evaluation. ⋯ Postgadolinium, spinal MR angiography in cases of suspected dural arteriovenous fistula provides information about intradural veins that supplements the diagnostic value of the MR imaging results, facilitates the subsequent digital subtraction angiography study, and, in treated cases, reflects the success of surgery and/or embolization.
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AJNR Am J Neuroradiol · Nov 1995
Endovascular treatment of fusiform aneurysms with stents and coils: technical feasibility in a swine model.
To assess the biomechanical feasibility of treating experimental fusiform aneurysms endovascularly with a combination of stents and coils. ⋯ Endovascular treatment of experimental fusiforms aneurysms using stents and coils is technically feasible. The stent maintains patency of the parent artery while allowing strategic coil placement in the aneurysm sac away from the origin of side branches. This technique may prove useful in the future treatment of intracranial fusiform aneurysms. However, potential sources of technical difficulties have been identified, and further longterm studies using an appropriate intracranial stent will be necessary before human application.
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AJNR Am J Neuroradiol · Oct 1995
Imaging of carotid artery stenosis: clinical efficacy and cost-effectiveness.
To determine the most accurate, safe, and cost-effective imaging protocol for selecting patients for carotid endarterectomy. ⋯ Ultrasound followed by confirmatory angiography is a cost-effective way to image patients suspected of carotid artery stenosis. MR angiography may become cost effective and lead to a better final patient outcome only when it can reliably replace invasive angiography as the preoperative examination.
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AJNR Am J Neuroradiol · Oct 1995
Improved detection of enhancing and nonenhancing lesions of multiple sclerosis with magnetization transfer.
To determine whether magnetization transfer imaging can improve visibility of contrast enhancement of multiple sclerosis plaques. ⋯ Magnetization transfer improves the visibility of enhancing multiple sclerosis lesions, because they have a higher contrast-to-noise ratio than conventional postcontrast T1-weighted images. High signal intensity on both nonenhancing and enhancing lesions noted only on precontrast T1-weighted magnetization transfer suggests a lipid signal was unmasked. If magnetization transfer is used in multiple sclerosis patients, a precontrast magnetization transfer image is necessary.