Radiopaedia.org

Left frontal sinus expansile mass lesion eliciting persistent dark signal on all pulse sequences with the absence of post-contrast enhancement. The lesion shows exophytic intra-orbital extension displacing the left eye globe and left superior rectus/levator palpebrae superioris muscle complex with subsequent proptosis. The lesion also shows a focal intracranial extension elevating the left frontal lobe.

Radiological findings are suggestive of a left frontal sinus osseous lesion, likely an osteoma.