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A lesion of increased signal intensity on the T2 and associated with positive mass effect lies in the postcentral gyrus of the parietal lobe and extends down to involve the superior temporal lobe on the left. The lesion is of heterogeneous signal intensity. No restricted diffusion. No contrast enhancement.
Conclusion: Features suggest a glioma of the left parietal lobe. The lack of contrast enhancement is in keeping with a low-grade tumour. Lack of T2-FLAIR mismatch and extensive cortical involvement raises the possibility of an oligodendroglioma.