File:Periosteal-chondroma-1.png

Summary

Author: Case courtesy of Dr Brian Gilcrease-Garcia, Radiopaedia.org, rID: 56933 Source:https://radiopaedia.org/cases/periosteal-chondroma-1?lang=gb Description: X-ray knee (lateral view)- Right knee radiographs (age-25) show an eccentric, cortically-based lytic lesion located at the anterolateral right proximal tibia (best visualised on oblique and lateral views). There is a small amount of internal chondroid calcification. The joint spaces of the knee are normal. No knee effusion, and no acute fracture. The small lytic mass associated with the anterolateral cortex of the tibia metaphysis shows evidence of chondroid-type mineralisation by radiography ("rings and arcs" pattern of calcification). MRI images nicely demonstrate the lesion originating from the superficial cortex, without intramedullary invasion. The absence of associated reactive marrow oedema is suggestive of a benign aetiology. The MR signal characteristics (T1 intermediate, T2 hyperintense) are typical of chondral tissue.

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