An<unk>  (plural:<unk> ta") is a new piece of bone usually growing on another piece of bone, typically the skull. It is a benign tumor. When the bone tumor grows on other bone it is known as "homoplastic<unk> "; when it grows on other tissue it is called "heteroplastic<unk> ".<unk>  represents the most common benign neoplasm of the nose and paranasal sinuses. The cause of<unk> ta is uncertain, but commonly accepted theories propose embryologic, traumatic, or infectious causes.<unk> ta are also found in Gardner's syndrome. Larger craniofacial<unk> ta may cause facial pain, headache, and infection due to obstructed nasofrontal ducts. Often, craniofacial<unk>  presents itself through ocular signs and symptoms (such as proptosis).
Osteoma
Bone cyst
Osteochondrosis
Osteochondroma
Osteoid osteoma
Osteoblastoma
Osteosarcoma
Osteopetrosis