Figure 2.

Male, 6 years old, diagnosis of pilocytic astrocytoma KIAA1549-BRAF fusion. Brain MRI: Axial T2WI, DWI, SWI, and T1W post-contrast (A,B,C,D) show a solid-cystic tumor located in the right cerebellar hemisphere and vermis, with mass effect, and heterogeneous hyperintense signal on T2WI (A). The tumor shows no diffusion restriction (B), a central component of hemorrhage characterized by a hypointense signal on SWI (C), confirmed on a CT study (not shown), and necrosis delineated by areas of enhancement (D). DWI, diffusion weighted imaging; SWI, susceptibility weighted imaging; T1W, T1-weighted; T2WI, T2-weighted image.