Fig. 4

Magnetic resonance imagining of the patient’s left knee showing a heterogeneous, solid, and soft tissue mass involving the proximal epimetaphysis of the tibia and extending to the subarticular cortex. a Preoperative scan. b Scan obtained 6 months postoperatively showing a mild decrease in the size of the lesion with increased sclerosis of the solid component. c Scan obtained 2.5 years postoperatively showing a further decrease in the size of the mass