


Osteoid Osteoma
Osteoid means a type of tissue that eventually turns to bone. Osteoma means a type of tumor unique to bones. They are small typical size is less than one inch across. These growths represent around ten percent of all benign bone tumors, with one percent representing spinal tumors. They can appear and also affect the bones of the arms, hands, fingers, ankles, or feet. They are discovered on the spine around fifteen percent of the time. Osteoid osteomas of the spine affect the posterior, or back area of the vertebrae rather than the anterior, or front region. However, any area of the spine could be affected. But they are most common in the low back.- 60% affect the lumbar spine lower back
- 27% affect the cervical spine or neck region
- 12% affects the thoracic spine or middle back
Risks
Osteoid osteoma is not cancerous and will not spread out to the various organ systems the way malignant cancer does. It can be discomforting, painful, and could have to be removed. There are some risks associated with osteoid osteomas including:Scoliosis
It could provoke muscle spasms of the erector spinae. These are the muscles that support the spine and could lead to scoliosis. The spine has a natural curvature. Scoliosis generates an S or C shaped curve to the left, right, or both ways affecting function and mobility. This type is more likely to contribute to the left or right curve of the spine affecting the lower back.


Incorrect diagnosis
Because osteoid osteoma can cause scoliosis, sometimes a doctor will focus on treating the abnormal curve instead of the osteoma.Nerve root compression
Most individuals do not pose a risk for nerve root compression. But there is a risk if the growth begins to press against the spinal cord, as it can interfere with nerve function. This can lead to spreading/radiating pain and sciatica.


Causes
The causes of osteoid osteoma are not completely understood. What is known is that men are three times more likely to be diagnosed than women. Young people also pose a risk at development. It can develop at any age, but around eighty percent are diagnosed in individuals under 30 years of age. The core of an osteoma is a growth called a nidus. Inside are growing tumor cells, blood vessels, along with cells that progress to bone. A bony shell encapsulates the whole thing.Signs and Symptoms
Osteoid osteomas usually cause a dull ache at the site of the tumor along with muscle spasms. The pain often gets worse at night. It can be relieved with non-steroidal anti-inflammatory medications like ibuprofen and aspirin. The pain can also be sharp, and occur during the day, worsening with activity and sometimes progressing to severe pain over time. In some cases, however, there are no symptoms.


Diagnosis
Doctors usually notice painful or swollen soft tissue around the tumor during a physical examination. There could be a lump, but this is rare. Imaging tests like an X-ray or a CT scan will be ordered. An x-ray can show the bone thickening, but a CT scan will show the nidus clearly as a dark center surrounded by white cortical bone. Sometimes a CT and MRI imaging scan is used in conjunction to diagnose osteoid osteomas. In some cases, a biopsy could be needed. This is taking a tissue sample and sending it to a lab to be examined under a microscope. However, this is rarely needed.

