Fig. 7

A 42-year-old woman with suspected primary benign bone tumors of the pelvis. a Preoperative axial CT image demonstrates osteolytic bone destruction in the fifth lumbar vertebra (yellow arrow) and expansile, osteolytic bone destruction with cortical interruption (yellow arrow). b-c The intraprocedural axial CT image (using bone windows) shows that the biopsy needle is inserted into the bone lesion (yellow arrow). The histopathologic biopsy results (d: hematoxylin and eosin, original magnification 40×, e: hematoxylin and eosin, original magnification 100×) diagnosed the bone lesion as a giant-cell tumor. Finally, the surgical histopathology results (f: hematoxylin and eosin, original magnification 40×) of the bone lesion confirmed the diagnosis of a giant-cell tumor. Immunohistochemistry showed that the monocyte-like cells were CD163 (+), CD68 (KP1) (+), Ki-67 (positive rate approximately 40%), p63 (+), and SMA (−)