正常头颅CT轴位鞍上池呈() ["A．圆形或椭圆形","B．梯形或双梯形","C．三角形或梭形","D．长方形或方形","E．五角或六角形"]
脑干结构不包括() ["A．桥脑","B．延髓","C．中脑","D．四叠体","E．颈髓"]
女，42岁，发作性意识丧失，抽搐7～8年，CT平扫右颞叶蝶骨嵴后方类圆形，密度略高病灶：边界清楚，增强扫描病灶明显均一强化，最可能的诊断是() ["A．右颞叶室管膜瘤","B．星形细胞瘤","C．脊索瘤","D．脑膜瘤","E．转移瘤"]
后颅窝占位病变可引起下列哪种() ["A．幕下疝","B．钩回疝","C．小脑扁桃体疝","D．海马回疝","E．扣带回疝"]
颅脑外伤，CT示大脑脚、胼胝体压部呈斑点样高和低密度，最可能的诊断是() ["A．脑震荡","B．脑挫裂伤","C．脑出血","D．脑剪切伤","E．脑白质出血"]
母亲妊娠期间易受外界不利因素的影响，包括：________、________、________、________、________等，以及________、________和________等都可影响胎儿发育。
