[Case report: Cemento-ossifying fibroma of the ethmoidal sinus presenting with exophthalmos].

Cemento-ossifying fibroma is a benign fibro-osseous tumor which contains fibrous tissue and varying amounts of calcified tissue resembling bone, cementum or both. The tumor is frequently seen in the mandibula and maxilla, but it may rarely affect the ethmoidal sinus. In this report, CT findings of cemento-ossifying fibroma located in the ethmoidal sinus are presented.