Fig. 1

A 22-year-old female presented with limping, pain aggravated on walking, and restricted movement of the left ankle for 7 months. The patient had no history of trauma and no constitutional symptoms. Examination revealed tenderness over the anterior aspect of the distal tibia, with painful and restricted range of motion of the left ankle. A Preoperative anteroposterior and lateral X-rays showing a well-defined expansile osteolytic lesion in the epi-metaphyseal region of the left distal tibia suggestive of GCTB. The tumor was classified as Campanacci grade III. B Sagittal, coronal and axial CT scans showing an osteolytic lesion occupying the anterior two-thirds of the epi-metaphyseal region of the left distal tibia with erosion of the articular surface. C Sagittal and coronal MRI images showing an eccentric expansile osteolytic lesion measuring 4 (craniocaudal) × 3.5 (transverse) × 2.5 (anteroposterior) cm breaching the articular surface with only the posterior one-third of the tibial plafond preserved with no soft tissue or intra-articular extension