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A right frontal lesion is present demonstrating mass-effect on the inferior aspect of the superior frontal gyrus. The lesion is T1 hypointense and T2 hyperintense with incomplete suppression, occasional areas of central irregular low signal and a peripheral high rim on FLAIR. The lesion demonstrates no enhancement, is well defined and there is no surrounding oedema. Whilst the distinction between intra and extra-axial location is somewhat difficult, a cortically-based tumour arising from the middle frontal gyrus is strongly favoured. No significant diffusion restriction. No intrinsic or surrounding gradient susceptibility cerebral blood volume (CBV) is not elevated and spectroscopy is equivocal. No additional lesions identified.
Conclusion: The lesion is favoured to represent a low-grade cortically-based tumour such as a DNET, diffuse astrocytoma or oligoastrocytoma.