The enlarged cisterna magna is an unrelated finding 发现枕大池扩大与此病无关。
2.
The transcerebellar ( or suboccipitobregmatic ) iew allows examination of the mid - brain and posterior fossa ; this iew is used for measurement of the transerse cerebellar diameter ( tcd ) and cisterna magna ( cm ) 经小脑平面可以检查中脑和颅后窝；该平面用来测量小脑横径（ tcd ）和颅后窝池（ cm ） 。
