Expansion of the frontal sinuses, mainly on the left side with erosion of the anterior, posterior walls and the superior margin of the left orbit. The inner table of the skull has a large defect.
The mucocole extends into anterior cranial fossa, mildly indenting the left frontal lobe. Large defect in the planum sphenoidale.Inferiorly, it extends into the upper aspect of the left orbit compressing the globe.
Expansion of the left anterior ethmoid air cells with smooth erosion of the lateral wall of the ethmoids and extension into the medial extraconal space combined displacing the globe inferolaterally and causing proptosis.
Prior surgery of the maxillary sinuses with residual mucoperiosteal thickening bilaterally. Mucoperiosteal thickening of the bilateral sphenoid sinuses, more marked on the right side. The ethmoid air cells on the right side are also completely opaque.