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 28, 2011
Psammomatoid Ossifying Fibroma
- Ossifying fibromas are benign fibro-osseus tumors, typically seen in the third decade of life.
- Most commonly found in the craniofacial bones; involvement of the mandible is not uncommon.
- Symptoms vary depending on tumor location. Nasal obstruction, rhinorrhea, epistaxis, and pain are commonly encountered symptoms. Rarely, facial disfigurement can be seen.
- Key Diagnostic Features: Well-defined heterogenous density mass lesion demonstrating areas of osseous matrix interspersed with areas of ground-glass opacification, and low attenuation containing fibrous tissue or retained mucus are seen. Lesional circumscription, prevalence of osteoblastic rimming around the bone trabeculae, and variability in tissue composition within the lesion can be considered to be diagnostic imaging features of this disease entity.
- DDx: Fibrous dysplasia, Osteoma, Osteogenic sarcoma
- Treatment: Surgical resection
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