Fig. 5
From: Manifestations of pilocytic astrocytoma: a pictorial review
A large, cystic CPA in a 7-year-old boy. (a) An axial T2-weighted image shows a hyperintense mass of the right cerebellar hemisphere with a less intense soft-tissue nodule along its medial margin and without surrounding oedema (arrows). Note the arachnoid cyst in the left middle cranial fossa. b On an axial FLAIR image, the cystic component shows low signal intensity that is higher than that of the CSF, and the soft tissue nodule is homogeneous and slightly hyperintense (arrows). c On a diffusion-weighted image, the mural nodule appears isointense (arrow). d An axial, contrast-enhanced, T1-weighted image demonstrates intense enhancement of the mural nodule (arrows)