Presentation
Non-specific knee discomfort without recent trauma. Incidental finding.
Patient Data
Age: 14 years
Gender: Female
From the case:
Non-ossifying fibroma
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2.5 cm metaphyseal lesion arising from the cortex and extending into the medullary
cavity with a sclerotic narrow zone of transition. No periostitis. Appearances
consistent with a non-ossifying fibroma.
Case Discussion
Non-ossifying fibromas (NOFs) are benign lesions commonly seen in children and usually of no clinical significance. Occasionally very large non-ossifying fibromas may require prophylactic curettage due to risk of a pathological fracture.
Often - as here - the appearance is so typical that no real differential diagnosis will be entertained.
NOFs are one of the "Don't touch" lesions.
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