Curettage is also a major method used for removing osteoid osteoma and osteoblastoma. Benign osteoblastoma is virtually indistinguishable from osteoid osteoma. Metastatic Ewing's cell sarcoma of the sinus and osteoid osteoma of the orbit. Localized osteosclerosis can be caused by injuries that compress the bone, by osteoarthritis, and osteoma. Often, craniofacial osteoma presents itself through ocular signs and symptoms (such as proptosis). Osteoma represents the most common benign neoplasm of the nose and paranasal sinuses.