Figure 1.

A. A well-defined 11 × 9 × 8 cm expansile osteolytic lesion extending from the left ischium to the lower arm of the left pubis in a 52-year-old man with progressive pain in his left hip and leg. Radiographic findings were consistent with the diagnosis of GCTB. B. 3 months after the start of denosumab treatment, there was no progression of disease and increased radiopacity of the lesion. C. 5 years after resection of the ischium and inferior ramus of the pubis followed by phenolization and cementation of the posterior acetabular wall, there was no evidence of recurrent disease.