Ethmoid osteoma with frontal and orbital extension: endoscopic removal and reconstruction

Endoscopy provides a safe and effective way of treating craniofacial bony benign lesions. This approach permits not only complete removal of the tumour, but also reconstruction of the bony boundaries as necessary. Osteoma is a rare, osteogenic tumour that usually grows slowly and asymptomatically. It is the most frequent benign neoplasm of the nose and paranasal sinuses. Orbital extension is a rare event that can give rise to ocular signs and symptoms; in such a case treatment is mandatory, although debate persists regarding the optimal approach. We report the case of a bulky fronto-ethmo-orbital osteoma that was treated using an endoscopic trans-nasal approach. The medial wall of the orbit was repaired by means of an implant of porous polyethylene endoscopically positioned using an "underlay" technique. The surgical technique is described and the reasons for the endoscopic choice are also discussed. Fifteen days after the operation the patient reported complete resolution of craniofacial pain. Nasoendoscopy showed complete integration of the polyethylene implant in the healing tissue 4 weeks after surgery. A CT scan performed 6 months postoperatively showed good ventilation of the sinonasal cavity and effective reconstruction of the medial orbital wall.