juveniles zerebelläres pilozytisches Astrozytom

Role of

diffusion-weighted imaging in differentiation between posterior fossa brain tumors. Juvenile pilocytic astrocytoma in a 9-year-old boy who presented with repeated headache and vomiting. a T1-weighted (T1WI) shows intra-axial cystic space-occupying lesion (SOL) in the left cerebellar hemisphere. b T2-weighted (T2WI) showing hyperintense cystic posterior fossa mass with isointense solid mural nodule attached to the inner side of the cystic mass. Note the cystic components and relatively solid components. c Post-contrast T1WI axial image showing mildly enhancing solid components and faint enhanced cystic wall. d Apparent diffusion coefficient (ADC) map: the cystic component is bright while the solid component is relatively lower than the cystic component with slight diffusion restriction