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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).〔(【引用サイトリンク】author=Michael S. Schwartz, MD; Dennis M. Crockett, MD )〕 ==Variants== * "Osteoma cutis, but there is currently no way of detecting if and when this is likely to occur. * "Fibro-osteoma" * "Chondro-osteoma" File:Osteom der Stirnhoehle Roentgen.jpg|Osteoma of the frontal sinus seen on x-ray File:Osteom der Stirnhoehle CT.jpg|Osteoma of the frontal sinus on CT 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「osteoma」の詳細全文を読む スポンサード リンク
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