Osteoid osteomas are small, benign osteoblastic lesions. Ethmoid bone osteoma has been very rarely reported. We report a rare case of osteoma of ethmoid sinus with orbital extension, in a 14-year-old boy. Excision of the tumor was conducted via external ethmoidectomy approach. Post-operative period was uneventfule.

Key words: Osteoid osteoma; Ethmoid sinus; External ethmoidectomy  
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