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Case report: Endoscopic endonasal removal of large osteoma in the ethmoid sinus. Problem: A 25-year-old man presented with a large osteoma in the right ethmoidal sinus.
Methodology: The osteoma was removed by an endoscopic endonasal approach with a curved diamond drill and an electromagnetic navigation system.
Result: Computed tomography 3 days after surgery showed complete removal of the osteoma and normal position of the right eyeball. No long-term follow-up results were available.
Conclusions: This clinical case highlights the use of the endoscopic endonasal approach for the safe and reliable treatment of sinus osteomas, particularly large osteomas. We also describe various manifestations of osteoma, its diagnosis, and surgical management.