Ossifying Fibroma of the Frontal Bone

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Abstract
AN OSSIFYING fibroma seldom originates in the frontal bone but more often involves the mandible or maxilla. The following case report illustrates complete removal of an ossifying fibroma limited to the frontal bone which was thought preoperatively to be a mucocele of the frontal sinus. Report of a Case A 62-year-old white woman consulted an ophthalmologist for "conjunctivitis" of her right eye. Evaluation disclosed the underlying disease process to be acute narrow angle glaucoma which was treated appropriately with resolution of her symptoms. However, minimal proptosis had been noted, and roentgenograms of the skull were obtained which disclosed "marked clouding of the right frontal sinus with a questionable defect of the frontal floor on the same side" (Fig 1). These findings were suggestive of a mucocele, and the right frontal sinus was explored through an external ethmofrontal approach. Following reflection of the orbital periosteum which was intact, a greyish-white mass

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