Enchondroma (proximal tibia)
Referred by GP with ongoing knee pain, query osteoarthritis. No history of trauma. No prior medical or surgical history.
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Incidental finding of well-circumscribed lesion with scalloped margins seen within proximal tibia. Mild spiking of tibial spines. Otherwise no evidence of arthritis. No fracture.
The well-defined lesion within the proximal tibia (metaphyseal region) with scalloped margins. The narrow transition zone, lack of periosteal reaction and location favours a benign lesion and the top differential diagnosis is enchondroma with the main differential diagnosis being bone infarct.