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Odontogenic tumors are any kind of abnormal growth in and around the jaw and teeth; many of these tumors are considered to be benign.

Optic neuritis (ON) involves an attack of inflammation (swelling) in your optic nerve.

Osteochondritis dissecans is a joint disorder in which a segment of bone and cartilage starts to separate from the rest of the bone.

Osteomyelitis is the term for a bone infection.

Osteosarcoma is the most common type of bone cancer among children, adolescents, and young adults.

A child or adolescent with obsessive-compulsive disorder has obsessive thoughts that are unwanted and related to fears, and uses compulsive rituals to control the fears.

Osteoblastoma is a benign, bone-forming tumor that’s most often found in the lower vertebrae of the spine or long bones of the lower extremity.

Osteochondroma is a typically non-cancerous (benign) bone tumor that generally appears near the growth plate.

Osteogenesis imperfecta (OI) is characterized by fragile bones that break easily without a specific cause.