Case of the Week
Section Editors: Matylda Machnowska1 and Anvita Pauranik2
1University of Toronto, Toronto, Ontario, Canada
2BC Children's Hospital, University of British Columbia, Vancouver, British Columbia, Canada
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March 30, 2009
Ossifying Fibroma
- Rare expansile, benign tumor that predominantly involves the maxillary (approximately 10'20% of patients) and mandibular (approximately 75%) bones.
- In rare cases, the tumor may involve the nasal cavity and long bones. The main difficulty in differential diagnosis is differentiating ossifying fibroma from fibrous dysplasia. Ossifying fibroma has a somewhat radiopaque, unilocular appearance with distinct boundaries with an eggshell character, whereas the border of fibrous dysplasia is diffuse and merges with normal bone.
- Simple curettage is enough when located in the mandible but a complete en bloc excision is required when these lesions are located in the maxilla and paranasal sinuses.
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