osteoblastoma 成骨細胞瘤; 骨母細胞瘤
os·teo·blas·to·ma /-blæˈstomə/ 名詞 成骨細胞瘤
osteoblastoma n : benign tumor of bone and fibrous tissue; occurs in the vertebrae or femur or tibia or arm bones (especially in young adults)