Presentation
Left knee pain.
Patient Data
Age: 15 years
Gender: Female
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X-ray demonstrates a narrow zone of transition lucency with sharply defined sclerotic margins in the proximal of the left tibia. No periosteal reaction or cortical destruction.
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MRI demonstrates an eccentric low signal (T1/T2 sequences) lesion composed of soft tissue located at the left tibia upper third anterior aspect. Cortical thinning is seen at the medial side of the lesion. No fluid-fluid levels, cortical destruction, or periosteal reaction. No surrounding edema and no extra-osseous abnormality.
Case Discussion
Regarding the above imaging findings, non-ossifying fibroma is the most likely diagnosis. The differential diagnoses include fibrous dysplasia, fibrous cortical defect, and aneurysmal bone cyst.
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