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Granulomatosis with polyangiitis of the skull base. a, b Post-contrast T1-weighted axial and coronal MR images showing enhancing inflammatory soft tissue involving the skull base and cavernous sinuses. There is also inflammatory change within the adjacent sphenoid sinus. c T2-weighted axial image of the same lesion at the level of the cavernous sinuses. d Post-contrast axial CT image again showing avid enhancement within durally based abnormal soft tissue
