Presentation
Left proptosis.
Patient Data
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.
The lesion appears densely calcific on CT brain examination, consistent with an osteoma.
Case Discussion
Paranasal sinus osteomas are common benign tumors, usually found incidentally. They may be symptomatic if they exert mass effect as in this case or if they obstruct the drainage of the paranasal sinuses.
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