Osteoma

Osteoma
Osteoma of external auditory meatus
Classification and external resources
Specialty
ICD-10	D16
ICD-9-CM	213.0
ICD-O	9180/0, 9191/0, 9200/0
Patient UK	Osteoma

An osteoma (plural: "osteomata") 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 osteoma"; when it grows on other tissue it is called "heteroplastic osteoma".

Osteoma represents the most common benign neoplasm of the nose and paranasal sinuses. The cause of osteomata is uncertain, but commonly accepted theories propose embryologic, traumatic, or infectious causes. Osteomata are also found in Gardner's syndrome. Larger craniofacial osteomata may cause facial pain, headache, and infection due to obstructed nasofrontal ducts. Often, craniofacial osteoma presents itself through ocular signs and symptoms (such as proptosis).

Variants

• "Osteoma cutis, but there is currently no way of detecting if and when this is likely to occur.
• "Fibro-osteoma"
• "Chondro-osteoma"

• 

  Osteoma of the frontal sinus seen on x-ray

• 

  Osteoma of the frontal sinus on CT

See also

• Osteosclerosis
• Familial adenomatous polyposis
• Exostosis
• Gardner syndrome
• Ganglion cyst

External links

• BoneTumor
• radio/498 at eMedicine - Osteoid osteoma
• derm/301 at eMedicine - Osteoma cutis
• Humapth #4724 (Pathology images)