MRI of the brain displays a well-circumscribed mass with a lobulated contour centered in the region of the right foramen of the Monro. There is an inferior extent into the suprasellar cistern with encasement of the A1 segment of the right anterior cerebral artery. There is no associated luminal narrowing. The mass is markedly hypointense on T1 and hyperintense on T2, though slightly less so compared to CSF. On FLAIR, there is partial suppression centrally with a peripheral rim of high signal. There is no associated edema, hemorrhage, calcification, diffusion restriction, or enhancement. No other lesions are identified.