The neoplastic spindle cells of osteosarcoma are seen to be making pink osteoid here. Osteoid production by a sarcoma is diagnostic of osteosarcoma.

• 骨肉瘤的梭形瘤细胞正在产生浅红色的类骨质。肉瘤的类骨质产物可以用于诊断骨肉瘤。