Fig. 2
a A resected specimen (3 cm × 3.5 cm) at the initial surgery. En-bloc excision was performed. b A low-power photomicrograph showing irregular trabeculae and prominent vessels. c A high-power photomicrograph showing irregular woven bone with osteoblastic rimming. No remarkable large, plump osteoblasts or atypical nuclei were observed, and many small blood vessels between the trabecular bones are seen with no atypia. The pathological findings did not support a diagnosis of osteosarcoma nor epithelioid osteoblastoma