Fig. 1

a Plain film of a 15-year-old female demonstrates an osteolytic lesion in the left periacetabular region. b CT scan presents the tumor involvement in the acetabulum, but the acetabulum cartilage and bone below it can be preserved. c Sketch illustrates that microwave inactivation was employed for this patient before intralesional curettage. d Plain film at 6 months after operation shows a suspicious lesion in the left pubis. No treatment was performed as there is no presentation of pain or other discomfort. e CT scan at 4 years after operation manifests that the intumescent lesion in the left pubis has mineralized edge. f Plain film at 11 years after operation shows no recurrence. g, h The patient had good function without any discomfort in the last follow-up