Figure 13a. Pleomorphic xanthoastrocytoma in an 8-year-old boy with a history of vomiting, headaches, and decreased coordination for several months. (a) Contrast-enhanced axial CT image shows a heterogeneous mass of the left frontal region with both cystlike and soft-tissue components. (b) Axial CT image obtained with bone windows shows lytic change in the adjacent calvaria. (c) Axial T1-weighted MR image shows that the mass is cystlike with a peripheral soft-tissue component. (d) Axial T2-weighted MR image shows high signal intensity of the cystlike area and relative low signal intensity of the soft-tissue component. (e) Contrast-enhanced coronal T1-weighted MR image shows intense enhancement of the soft-tissue portion of the mass.