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An osteoid osteoma is a type of bone tumor. It is not cancer (benign). It remains in the same place it starts. It will not spread to other bones or parts of your body.
The center of an osteoid osteoma is the nidus. It consists of growing tumor cells, blood vessels, and cells that eventually form bone. A bony shell surrounds the nidus.
Usually, osteoid osteomas are small tumors that measure less than an inch across. They typically form in the long bones, especially the thigh (femur) and shin (tibia) bones. They may also develop in the bones of the spine, arms, hands, fingers, ankles, or feet. They can occur in other bones. But that is much less common.
Osteoid osteomas tend to be painful. They cause a dull, achy pain that can be moderate to severe. The pain is often worse at night.
Osteoid osteomas occur more often in men than in women. They typically occur in children and young adults up to about age 24. But they can occur at any age.
Researchers are still working to understand what causes osteoid osteomas to form. They seem to start with inflammation in the bone. When that occurs, blood vessels in the area start to expand and grow. Bone-producing cells called osteoblasts soon start to multiply. They lay down the building blocks for bone. Cells that break down bone, called osteoclasts, also become part of the osteoma. The growing tumor puts pressure on the surrounding bone. This hardens and forms a shell around the tumor.
Often there is no history of injury or infection at the site where the osteoid osteoma forms.
The most common symptom of an osteoid osteoma is pain not caused by an injury. The pain is often achy and dull. The pain can be intense. It often tends to get worse at night. It may even wake you from sleep. Over-the-counter pain medicines, such as aspirin or ibuprofen, may help ease your pain. Depending on the location, other signs and symptoms can include:
Many people with osteoid osteomas have pain for months or even years before seeing their healthcare provider. In children, people may assume the pain is from growing pains. Unlike growing pains, physical activity has no effect on the pain of osteoid osteomas.
To find the cause of the pain, your healthcare provider will ask about the nature and severity of the pain. He or she may also ask:
X-rays can help your healthcare provider diagnose the osteoid osteoma. On an X-ray, the bony shell appears white and the nidus will appear dark.
At times, other imaging studies can help make sure that something else, such as an infection or cancer, is not causing your pain. These studies may include:
If your healthcare provider still isn't sure what is causing your pain, you may need blood tests and bone biopsies.
Osteoid osteomas may shrink on their own. But that usually takes years. Some people get pain relief from nonsteroidal anti-inflammatory drugs (NSAIDs). Some NSAIDs, such as aspirin, ibuprofen, and naproxen, are available without a prescription. Others are only available by prescription. NSAIDs may speed up the shrinkage of osteoid osteomas. But they can cause problems such as stomach irritation, ulcers, bleeding, high blood pressure, rash, and ankle swelling. They can sometimes also cause kidney or heart problems.
Because osteoid osteomas can be quite painful and take a long time to go away, healthcare providers often treat them more aggressively. Treatment options include:
If you need surgery to remove an osteoid osteoma, an orthopedic surgeon will do the procedure. You will likely get general anesthesia so that you can sleep through the surgery without feeling any pain. Regional anesthesia, where you only have part of your body numbed, may be an option if the tumor is in a small bone. You may need to stay in the hospital for several days. You may need to work with a physical therapist even after you go home.
CT-guided drill resections and radiofrequency ablations are less invasive options. An interventional radiologist can do these procedures. Your care team will use a CT scan to precisely locate the osteoid osteoma. The healthcare provider will then use a special drill or heated probe to remove or destroy it. The procedure can take place under general or regional anesthesia. You may be able to go home within a couple hours afterward. You will still need to limit your activities for a while. But you may be able to return to school or work within a few days.
Osteoid osteomas can be quite painful. A few complications can occur because of swelling associated with the bone and the location of the osteoma. Examples include:
You should call your healthcare provider if you are having pain in your bones that doesn’t go away. You should call right away if you have any of the following symptoms:
Tips to help you get the most from a visit to your healthcare provider:
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