Figure 1: Sagittal FLAIR (top row left) and T1WI post contrast (top row right) images demonstrate a lobular, avidly enhancing lesion within the third ventricle. T2 coronal (bottom) image illustrates dilatation of the foramen of Monro and of the lateral ventricles due to obstruction by this choroid plexus papilloma.
Figure 2: This lobulated enhancing intraventricular lesion is of intermediate signal on axial FLAIR (top row left) image. The axial T2WI (top row right) demonstrates surrounding CSF signal clefts that more easily characterize this lesion as intraventricular. This choroid plexus papilloma also demonstrates avid enhancement on T1WI post contrast (bottom row left) and hyperperfusion on cerebral blood volume image (bottom row right).