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Figure 1: The lesion was located in fourth ventricular. Computed tomography images showed the mass was iso-dense with necrosis (a). Precontrast magnetic resonance imaging showed the mass had a well-defined border that was hypointense on T1-weighted imaging (b), hyperintense on T2-weighted imaging (c) and T2-fluid attenuated inversion recovery (d), and iso-intense on diffusion-weighted images (e). The susceptibility weighted imaging showed hypointense in the solid component (f). Contrast magnetic resonance imaging showed the mass had obviously ring contrast enhancement (g). Regional cerebral blood flow (h), regional cerebral blood volume (i), and mean transit time (j) of dynamic susceptibility contrast showed that the mass had low perfusion

Figure 1: The lesion was located in fourth ventricular. Computed tomography images showed the mass was iso-dense with necrosis (a). Precontrast magnetic resonance imaging showed the mass had a well-defined border that was hypointense on T1-weighted imaging (b), hyperintense on T2-weighted imaging (c) and T2-fluid attenuated inversion recovery (d), and iso-intense on diffusion-weighted images (e). The susceptibility weighted imaging showed hypointense in the solid component (f). Contrast magnetic resonance imaging showed the mass had obviously ring contrast enhancement (g). Regional cerebral blood flow (h), regional cerebral blood volume (i), and mean transit time (j) of dynamic susceptibility contrast showed that the mass had low perfusion