LAUSR

Osteoblastoma is a rare benign bone-forming tumor that accounts for approximately 1% of all bone neoplasm [1–4]. It may occur in any area of the skeleton, but it is more frequently observed in the spine (mainly in the mobile segments whereas sacrum is rarely affected) [1, 5]. Due to the rarity of the tumor and the usual delay in diagnosis, the optimal treatment of sacral osteoblastomas is controversial [1, 5–8]. Although benign, these tumors may occasionally pose a challenge in histopathologic evaluation and differential diagnosis with malignant tumors as well as in the choice of adequate surgical treatment [6, 7].