There is a ground-glass osseous lesion at the level of the right frontal sinus recess and ostium. The lesion attenuates the frontal recess, which however remains patent with a clear right frontal sinus additionally.
There is a deviated and asymmetric nasal septum and a small mucous retention cyst within the left sphenoid sinus. The paranasal sinuses are otherwise clear.
Image courtesy of Dr. VKS Bhagwandas.