患者女,18个月,主诉不能独走1月余,余无特殊异常。影像所见:平扫:后颅窝中心区类圆形混杂信号占位,境界清晰,大小(左右径×前后径×上下径)约40.8 mm×36.8mm×52.8 mm,大部为长T_1、等T_2信号(图1、2),T_2 FLAIR等信号为主(图3),DWI高信号为主(图4),ADC低信号为 Female patient, 18 months, the chief complaint can not go away more than 1 month, I no special abnormalities. Image seen: plain scan: posterior fossa central area of ​​circular mixed signal occupies a clear state, the size (left and right diameter × front and back diameter × up and down diameter) about 40.8 mm × 36.8mm × 52.8 mm, mostly long T_1, Such as T_2 signal (Figure 1,2), T_2 FLAIR and other signals dominated (Figure 3), DWI high signal-based (Figure 4), ADC low signal is