1、AVM.Axial T2-weighted MR image 示蛇形迂曲的流空血管.Photograph（病理）of the gross（大体）specimen demonstrates dilated arteries and veins(arrows).AVM.Axial MRA from a TOF sequence shows a dilated feeding left middle cerebral artery(thin arrow)and draining veins(thick arrows).Cavernous angioma.Axial T2-weighted MR im
2、age:with a thick hypointensm（低信号）rim.高倍光学显微镜(400 x;H-E stain)示非常多的大小不等的血管腔隙.它们互相粘在一起，间隙内没有脑组织介入 Venous malformation.Axial spin-echo T2-weighted MR image of the brain shows 桥脑偏左侧管状的流空信号伴放射状分布回流小静脉Vein of Galen malformation.Sagittal spin-echo T1-weighted MR image 示Galen静脉区一个巨大的血管流空信号(*).Sagittal PC MR
3、A 示静脉畸形及与之相连的血管.硬膜下毛细血管瘤硬膜下毛细血管瘤.髓外硬膜下病变(*)分叶的结节状病变伴脊髓表面间断出现的流空信号 小血管内衬成熟的扁平内皮细胞(200 x;H-E stain)AVM of the spinal cord.Sagittal T2WI shows 沿脊髓表面的流空信号，颈C6-7水平蛇形的血管结构.Sagittal contrast-enhanced three-dimensional MR angiogram demonstrates 一个瘤巢(thick arrow)伴粗大的供血动脉(thin arrow).椎体血管瘤椎体血管瘤.Sagittal T1-weighted and T2-weighted MR images demonstrate a 椎体血管瘤伴条状的高信号（箭）.
