MR imaging of case 4. A and B, Axial T2WI (A) and T1WI (B) show heterogeneous signal-intensity changes at the right BG, involving the genu of corpus callosum and septum pellucidum, and the right thalamus is also involved (not shown). C, SWI demonstrates obvious heterogeneous hypointensity together with fluid-fluid level. D, Heterogeneous enhancement in the BG and subependymal spread are noted on the postcontrast T1WI.