Figure 2c. Cerebellar pilocytic astrocytoma. (a) Axial CT image shows a well-marginated mass of the right cerebellar hemisphere. The mass has both cystic (c) and soft-tissue (s) components. (b) Axial T2-weighted image reveals predominant hyperintensity within the mass with slightly lower signal intensity of the soft-tissue component. (c) Contrast material-enhanced axial T1-weighted image demonstrates intense enhancement of the soft-tissue nodule and lack of enhancement of the cystic portion. (d) Intraoperative photograph shows the smooth margin of the cystic portion (c).