Fig. 1.

Initial presentation of right tibial diaphyseal lesion:

Radiolucent lesion with medullary expansion and endosteal scalloping shown in: (A) AP radiograph; (B) Coronal CT scan showing a well circumscribed lesion with endosteal scalloping; (C) Coronal T1 with fat saturation MRI; (D) Thallium scan showing moderate heterogeneous uptake in the right proximal tibia on delayed 4 h planar imaging; (E) Core biopsy showing spindle cell proliferation (red arrow) and fibrous stroma with immature bone formation (green arrow), consistent with fibrous dysplasia.