图示由不规则反应性新生骨组成的骨样骨瘤。骨样骨瘤常见于十几岁男性中轴骨骼（尤其是胫骨和股骨）的骨皮质。成骨细胞瘤恰是椎骨上的大骨样骨瘤。为良性肿瘤，可通过切除治愈。
This is the central nidus of an osteoid osteoma composed of irregular reactive new bone. Osteoid osteomas usually occur in the axial skeleton (especially tibia and femur) in bone cortex of young males in the second decade of life. An osteoblastoma is just a big osteoid osteoma in the vertebra. These lesions are benign and cured by resection.