目的比较多参数三维假连续式动脉自旋标记灌注成像(3D p CASL)与动态磁敏感增强灌注成像(DSC PWI)对短暂性脑缺血发作(TIA)责任病灶的检出率。方法比较39例临床诊断TIA患者,并在首次发作24 h内进行磁共振检查。扫描序列包括常规头颅MR成像、MRA(MRA),DWI、3D p CASL(选取两个标记延迟时间post-labeling time,PLD,PLD=1.5 s及PLD=2.5 s),DSC PWI。后处理获取3D p CASL的脑血流(CBF)图像和DSC PWI的Tmax图像。比较不同灌注方法与MRA及DWI结合法对于缺血病灶检出率和缺血面积。结果 TIA患者的缺血病灶检出率,3D p CASL(PLD1.5 s及PLD2.5 s)的CBF图像与DSC PWI Tmax对比无差异;3D p CASL(PLD1.5 s)的CBF图像对于缺血的检出率高于MRA结合DWI法;DSC PWI Tmax、3D p CASL(PLD2.5 s)CBF与MRA结合DWI法无差异。显示低灌注面积,3D p CASL(PLD1.5 s)的CBF图像显示的面积最大,其次是DSC PWI Tmax,而3D p CASL(PLD2.5 s)的CBF图像显示的低灌注面积最小。结论 3D p CASL脑灌注成像技术无创、快速、可重复性强,推荐作为临床可疑TIA患者的影像筛查手段,不同PLD的3D p CASL序列对于病灶的检出及缺血面积的显示有差异,选择较短PLD有可能提高病灶的检出率。
目的采用三维准连续式动脉自旋标记(3D p CASL)技术定量分析轻中度高血压患者脑血流动力学变化。方法 58例高血压患者和34例年龄相匹配的健康志愿者在3.0T MR扫描仪上行全脑3D p CASL扫描。基于3D p CASL序列获得脑血流(CBF)图,采用统计参数图8提取各脑区的CBF值,采用手绘法获取各脑白质区的CBF值。结果与健康对照组相比,高血压患者CBF在双侧半卵圆中心(P=0.000,P=0.000)、侧脑室旁白质(P=0.001,P=0.002)、胼胝体压部(P=0.003)、额叶(P=0.003)、顶叶(P=0.014)、枕叶(P=0.002)、颞叶(P=0.006)、延髓(P=0.012)、脑桥(P=0.016)、中脑(P=0.034)、小脑(P=0.000)及灰质(P=0.001)均明显降低,而在丘脑、苍白球、壳核及胼胝体膝部的CBF值差异均无统计学意义(P均>0.05)。结论 3D p CASL序列在高血压患者常规磁共振成像序列阴性时即可探测到血流动力学的变化,这些CBF下降的区域提示可能增加了高血压相关脑小血管病发生的风险。
GANGLIONEUROMA is considered as the most mature and noninvasive form of neuroblastic tumors. It derives from neural crest cells, and can arise from wherever sympathetic tissue exists, including neck, posterior mediastinum, adrenal gland, retroperitoneum and pelvis. The two most common locations for this tumor are retroperitoneum and posterior mediastinum; infrequently it occurs in the intracranial re-gion,2-8 with only three cases has been reported arising from trigeminal nerve.2-4 The current paper presents a 49-year-old male patient with a ganglioneuroma arising from right trigeminal ganglion and extending to the mid-dle-posterior cranial fossa. We summarized the clinical and diagnostic characteristics of this extremely rare tumor, in comparison with the three reported cases in literatures.
