大脑动静脉畸形影像表现PPT学习教案

1、会计学1大脑动静脉畸形影像表现大脑动静脉畸形影像表现第1页/共55页第2页/共55页第3页/共55页第4页/共55页第5页/共55页第6页/共55页第7页/共55页第8页/共55页第9页/共55页第10页/共55页第11页/共55页第12页/共55页第13页/共55页第14页/共55页第15页/共55页第16页/共55页第17页/共55页左侧顶枕叶动静脉畸形第18页/共55页A图：CT平扫见右顶部有一边缘不清的片状及纡曲条状高密度影B图：CT增强见区域内斑点状及条状强化，边缘不清，无占位性C图：MRA造影：脑右侧动脉的顶后支及脑后动脉的顶枕支增粗，并于两支血管吻合处见一畸形血管团第19页/共5

2、5页(a) Axial contrast materialenhanced CT scan shows a tangle of intensely enhancing tubular structures embedded in the left parietal lobe, a finding that is compatible with a nidus.Hyperattenuation representing intraventricular hemorrhage is noted in the ventricles(b) Maximum intensity projection im

3、age (basal view) from CT angiographic data shows enlargement of the left middle cerebral artery (MCA) (relative to the right side), which supplies the nidus(c) Lateral left internal carotid angiogram reveals a glomerular type nidus in a cortical location,supplied mainly by the posterior parietal and

4、 angular branches of the left MCA, with early drainage into a left parietal cortical vein, findings that confirmed the diagnosis of a brain AVM第20页/共55页(a, b) Axial unenhanced (a) and contrast-enhanced (b) CT scans show intensely enhancing vascular structures at the left thalamus. Although no eviden

5、ce of hemorrhage was seen at CT, there was strong clinical suspicion for rupture. (c) Lateral left vertebral angiogram helps confirm the presence of a thalamic brain AVM, supplied by the thalamoperforator vessels and left posterior choroidal branches and draining mainly into the vein of Galen and mi

6、nimally into the left basal vein of Rosenthal (arrows). Note the small venous pouches (arrowheads), whose presence suggests a high risk of hemorrhage第21页/共55页第22页/共55页第23页/共55页第24页/共55页第25页/共55页第26页/共55页第27页/共55页第28页/共55页第29页/共55页第30页/共55页第31页/共55页第32页/共55页第33页/共55页第34页/共55页第35页/共55页第36页/共55页第37页/共55页第38页/共55页第39页/共55页第40页/共55页第41页/共55页第42页/共55页右额挫伤第43页/共55页第44页/共55页第45页/共55页A；轴位T1WI平扫 B：轴位T2WI平扫 C：左侧颈内动脉造影（正位）MR平扫显示左侧中颅窝大脑中动脉走行处圆形流空影。由于血流缓慢，T1WI动脉瘤内呈混杂信号。瘤周高信号环为血栓形成（白箭所示）。DSA显示动脉瘤起源于左侧大脑中动脉第46页/共55页第47页/共55页女，34岁A.轴位T1WI示左侧海绵窦稍低信号肿块，信号稍不均匀，病灶侵入鞍内，呈哑铃状，边界清晰，同侧颈内动脉受压先前移位B.轴位T2WI呈均匀极高信号