Figure 5a. Classic appearance of a cerebellar pilocytic astrocytoma. (a) Axial T2-weighted image shows a hyperintense mass (m) of the left cerebellar hemisphere with a less intense soft-tissue nodule (n) along its posterolateral margin. Note absence of surrounding vasogenic edema. (b) Contrast-enhanced coronal T1-weighted image demonstrates intense enhancement of the mural nodule.