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Non‐contrast sagittal reformat of CT paranasal sinuses (a) of a 72‐year‐old male patient with GPA showing bony destruction and osteomyelitis of the ethmoid and sphenoid bones (arrows). Focal hyperaemia and increased osteoblastic activity centred in the sphenoid bone extending to the sella turcica and clivus were present on the nuclear medicine bone scan (arrowhead) (b).
