半卵圆中心是() ["A．投射纤维","B．皮层下灰质","C．皮层下纤维","D．连合纤维","E．弓形纤维"] 关于胆脂瘤特点，下列描述哪项错误() ["A．青壮年多见","B．好发于桥小脑角、鞍上池","C．可有脂肪密度结构","D．多为脑脊液密度","E．增强扫描明显强化"] 轴位CT平扫难以确定病变位于幕上或幕下时，用哪一种方法帮助定位最佳() ["A．动态增强扫描","B．重叠扫描","C．薄层CT扫描","D．冠状位增强扫描","E．轴位增强扫描"] 女，75岁，突发左侧肢体无力，嘴角歪斜，言语表达不清，CT如图，最可能的诊断是() ["A．右侧颞顶枕叶梗死","B．星形细胞瘤","C．脑脓肿","D．少枝胶质细胞瘤","E．脑囊肿"] 男，15岁，进行性头痛1年余，CT检查，最可能的诊断为() ["A．脑膜瘤","B．脑血管畸形","C．转移瘤","D．淋巴瘤","E．胶质母细胞瘤"] Meckel腔内有()