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[A case of orbital osteoma--summary of the case reports in Japan, and the usefulness of the microsurgical drilling procedure in surgical treatment of orbital osteoma].

A 57-year-old woman was admitted with a 3-month history of diplopia and exophthalmos in the right eye. Plain skull X-P and axial CT demonstrated two bony tumors. One involved her right orbit, frontal sinus and ethmoidal sinus, and the other was located in the left occipital bone. The right intraorbital tumor was removed almost totally via the superomedial orbital approach by means of microsurgical drilling. Histopathological examination revealed mature osteoma. The microsurgical drilling procedure was helpful in obtaining an optimal result from surgical treatment of the orbital osteoma.