The cause of<unk>  is unknown. Histologically,<unk>  are similar to osteoid osteomas, producing both osteoid and primitive woven bone amidst fibrovascular connective tissue, the difference being that<unk>  can grow larger than 2.0 cm in diameter while osteoid osteomas cannot. Although the tumor is usually considered benign, a controversial aggressive variant has been described in the literature, with histologic features similar to those of malignant tumors such as an osteosarcoma.
Osteoblastoma
Osteoma
Osteochondroma
Osteosarcoma
Enchondroma
Bone cyst
Osteoid osteoma
Brown tumor