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Supratentorial Intraparenchymal Haemorrhages during Spine Surgery
Leung, Gilberto Ka Kit,Chan, Johnny Ping Hon The Korean Neurosurgical Society 2014 Journal of Korean neurosurgical society Vol.55 No.2
Intracranial haemorrhages are rare but potentially life-threatening complications of spine surgery. Most reported cases involved subdural or cerebellar haemorrhages; supratentorial parenchymal bleeding is very uncommon. We report a 28-year-old woman who underwent resection of a thoracic Ewing's sarcoma, and developed fatal haemorrhages around her cerebral metastases during surgery. The clinical presentations, possible pathogenesis and potential preventive measures are discussed. Patients with disseminated metastases within the neural axis are at risks of intracranial complications during spine surgery. The presence of intracranial mass lesions should be considered as a relative contraindication to intradural spine surgery.
Anderson Chun On Tsang,Simon Sui Man Lai,Wai Choi Chung,Abraham Yik Sau Tang,Gilberto Ka Kit Leung,Alexander Kai Kei Poon,Alfred Cheuk Hang Yu,Kwok Wing Chow 대한초음파의학회 2015 ULTRASONOGRAPHY Vol.34 No.2
Purpose: The aim of this study was to validate a computational fluid dynamics (CFD) simulationof flow-diverter treatment through Doppler ultrasonography measurements in patient-specificmodels of intracranial bifurcation and side-wall aneurysms. Methods: Computational and physical models of patient-specific bifurcation and sidewallaneurysms were constructed from computed tomography angiography with use ofstereolithography, a three-dimensional printing technology. Flow dynamics parametersbefore and after flow-diverter treatment were measured with pulse-wave and color Dopplerultrasonography, and then compared with CFD simulations. Results: CFD simulations showed drastic flow reduction after flow-diverter treatment in bothaneurysms. The mean volume flow rate decreased by 90% and 85% for the bifurcation aneurysmand the side-wall aneurysm, respectively. Velocity contour plots from computer simulationsbefore and after flow diversion closely resembled the patterns obtained by color Dopplerultrasonography. Conclusion: The CFD estimation of flow reduction in aneurysms treated with a flow-divertingstent was verified by Doppler ultrasonography in patient-specific phantom models of bifurcationand side-wall aneurysms. The combination of CFD and ultrasonography may constitute a feasibleand reliable technique in studying the treatment of intracranial aneurysms with flow-diverting stents.