A large lobulated central cystic mass arising from the sella/parasellar region extending to the frontal lobe, more on the left. The mass is isointense on T1 to grey matter and hyperintense on T2/ FLAIR. It demonstrates peripheral enhancement on T1 post-contrast. Compressive mass effects on the pituitary gland, frontal cortex (with thinning), displacing the optic chiasm and infundibulum posteriorly, elevating the mamillary body and corpus callosum. The anterior horns of the lateral ventricles are effaced and the posterior horn of the right lateral ventricle is dilated.
There is mild perilesional edema. Also noted is transependymal edema around the lateral ventricles.