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osteoid osteoma
An osteoid osteoma is a benign bone tumor that arises from osteoblasts and was originally thought to be a smaller version of an osteoblastoma. Osteoid osteomas tend to be less than 1.5 cm in size. The tumor can be in any bone in the body but are most common in long bones, such as the femur and tibia. They account for 10 to 12 percent of all benign bone tumors. "Osteoid osteomas may occur at any age, and are most common in patients between the ages of 4 and 25 years old. Males are affected approximately three times more commonly than females."〔http://orthoinfo.aaos.org/topic.cfm?topic=A00507〕
==Presentation==
Characterized by being less than 1.5 cm in diameter, osteoid osteomas most frequently occur in young men (Male:Female ratio 3:1) and may occur in any bone of the body, most frequently around the knee but often also seen in the vertebrae, in the long bones and less commonly in the mandible or other craniofacial bones.
Severe pain typically occurs at night, but can also be constant at any time of day. The chief complaint may only be of dull pain which is non radiating and persistent throughout 24 hours but increases significantly at night. Pain tends to be relieved with NSAIDs such as ibuprofen.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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