[名词解释] 骨龄(boneage)

发育(development) 男，15岁，头痛、呕吐2周，CT示四脑室扩大，内有菜花样混杂密度，不均匀强化，最可能的诊断为() ["A．脑膜瘤","B．脉络膜乳头状瘤","C．室管膜瘤","D．髓母细胞瘤","E．星形细胞瘤"] 生长(grew) 体重指数(bodymassindexBMI) 脑梗死CT水肿高峰发生于发病后() ["A．12小时","B．24小时","C．2～5天","D．1周","E．10天左右"] 骨龄(boneage)