Non-ossifying fibroma

Case contributed by Abbas M. Mahmood
Diagnosis almost certain

Presentation

Lower leg discomfort

Patient Data

Age: 12 years
Gender: Male
x-ray

Cortically based lucent lesions with a sclerotic rim with few thin septations, located eccentrically in the metadiaphysis region.

mri

There is an eccentric, cortically based lesion at metadiaphyseal region of distal left tibia composed of soft tissue with low T1 and T2 signal, which enhances following contrast administration measured 39x19 mm. No fluid-fluid levels, no surrounding edema or enhancement, and no extra-osseous abnormality. 

Case Discussion

As non-ossifying fibroma is one of the skeletal “Don’t touch” lesions. Biopsy was not performed to put the case as a diagnosis certain.

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