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Extensive extraaxial prominently enhancing mass encases the left frontal lobe with thickened T2 and FLAIR hyperintense dura extending to involve the falx, occluding the anterior 1/3 of the superior sagittal sinus, crossing the midline over the right frontal lobe, and extending inferiorly over the left frontal lobe to the floor of the anterior cranial fossa.
In addition, there is a focal area of enhancement in the subarachnoid space. The tissue shows low ADC values and is relatively hypointense on T2.
Conclusion
The characteristics of the extra-axial mass are consistent with tumour and the favoured diagnosis is lymphoma.