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A large enhancing, mildly irregular mass is centred on the genu of the corpus callosum in the frontal lobes, crossing the midline involving both the left and right frontal lobes with extensive surrounding vasogenic oedema. A further similar mass is seen just inferiorly within the inferior left frontal lobe. There is significant mass-effect with compression of the frontal horns of both lateral ventricles and approximately 5 mm of midline shift to the right at the level of the body of the lateral ventricles. No hydrocephalus. No haemorrhage.
A third and different lesion appearing partly calcified and enhancing is extra axial deep to the inner table of the right pterion is suggestive of a meningioma.
Conclusion: Enhancing frontal mass lesions centred on the genu of the corpus callosum most likely represents a lymphoma or high-grade butterfly glioma. Given the clinical history, metastatic disease is also a possibility but felt less likely.