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Fig 5. A, Coronal T1-weighted postcontrast MR image in a 69-year-old man with osteoradionecrosis causing a large defect in the sphenoid sinus floor and a nonenhancing mass (arrow) within the sphenoid sinus that also shows thickened enhancing mucosa in the roof of the sinus (arrowheads), 5 years after radiation therapy ("rhinolith" at surgery). B, Coronal T2-weighted MR image in the same patient showing the mass is of low-intermediate signal intensity (arrow) and radiation-induced injury in the white matter of the inferior aspects of both temporal lobes.
