On MRI,the mass was isointense to graymatter on T 1WI and isointense or slightly hyperintense on PDW and T 2WI, and not enhanced after Gd DTPA injection.

• MRI表现在T1WI上与灰质等信号 ,在PDW和T2 WI上等信号或轻度高信号 ,肿块不增强。