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What are the possibilities for the right sided abnormality?
The two possibilities are A) that this represents metastatic disease, although the size of the main lesion would be unusual B) this is multifocal GBM.
A large left sided mass with central non-enhancement and peripheral nodular enhancement and restricted diffusion is present surrounded by tumour oedema.
On the right, seen only on the T2/FLAIR images is a temporal region of high T2 signal.