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Figure 1: Upper panel (a,b and c) shows the pre-operative contrast MRI images of large olfactory groove meningioma, operated by a bifrontal craniotomy with pre-operative insertion of a lumbar subarachnoid drain. Lower panel (d, e and f) The post-operative images shows complete tumour excision and minimal changes in the frontal lobes despite considerable peritumoural edema. Enhancement along the anterior cranial base is due to the vascularised pericranial graft

Figure 1: Upper panel (a,b and c) shows the pre-operative contrast MRI images of large olfactory groove meningioma, operated by a bifrontal craniotomy with pre-operative insertion of a lumbar subarachnoid drain. Lower panel (d, e and f) The post-operative images shows complete tumour excision and minimal changes in the frontal lobes despite considerable peritumoural edema. Enhancement along the anterior cranial base is due to the vascularised pericranial graft