Non-ossifying fibroma

• Other name – fibrous cortical defect
• 10-20 years
• Asymptomatic
• Ossify with age
• Well-defined lytic cortical based lesion with narrow zone of transition showing thinning of cortex with no adjacent marrow edema or periostea reaction
• Do not touch lesions

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Shah, Jignesh N., et al. “Pediatric benign bone tumors: what does the radiologist need to know?: pediatric imaging.” RadioGraphics 37.3 (2017): 1001-1002.