Suprasellar arachnoid cyst
Loss of vision.
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A large extra-axial CSF intensity lesion expanding the suprasellar cistern with a thin wall, no enhancement or nodularity and no diffusion restriction, extending into the third ventricle, the prepontine and interpeduncular cisterns with splaying of the cerebral peduncles.
This mass is causing displacement and splaying of the vascular structures around, displacing the optic chiasm superiorly.
The pituitary gland and stalk are well identified.