Suprasellar arachnoid cyst
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The MRI sequences demonstrate a suprasellar cyst of CSF signal on all sequences, compressing and displacing the 3rd ventricle superiorly and optic chiasma and infundibulum anteriorly with an asymmetrical dilatation of the lateral ventricles. The 4th ventricle is of normal size and shape.
MRI features most consistent with a suprasellar arachnoid cyst compressing the 3rd ventricle with biventricular hydrocephalus.