Oval and oval like low signals were showed in 3 and isosignals in 1 on T 1 weighted images of MRI and high signals with clear edge on T 2 weighted images.

• MRI显示圆形及类圆形T1WI像低信号 3例 ,等信号 1例 ; T2 WI像均为高信号 ,边缘清楚。