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MRI of the brain demonstrates a large multi-lobulated mass with intrinsic high T1 signal and heterogeneous T2 signal, including large areas of signal drop out. The mass appears to arise form the pituitary fossa which is significantly expanded, and extend superiorly invaginating into the third ventricle. The outflow of the lateral ventricles is compromised with evidence of hydrocephalus and transependymal oedema.
The optic chiasm is elevated and stretched over the anterior part of the mass, with the more posterior and superior component extending between the optic tracts.