Fig. 7.

A pilocytic astrocytoma with a predominantly solid mass and a minimal cyst-like component in a 14-year-old girl. a This coronal T2-weighted image shows a large, well-marginated mass, involving the vermis and both cerebellar hemispheres that effaces the fourth ventricle. b On an axial FLAIR image, the solid mass shows high signal intensity with hypointense cystic areas (arrows). c On an axial contrast-enhanced image, the mass shows inhomogeneous contrast enhancement, with nodules that exhibit intense enhancement (arrows) and other cystic areas that remain unenhanced (arrowheads)