Pigmented villonodular synovitis from WikiPedia
What is pigmented villonodular synovitis?
Pigmented villonodular synovitis (PVNS) is a joint problem that usually affects the hip or knee. It can also occur in the shoulder, ankle, elbow, hand or foot.
When you have PVNS, the lining of a joint becomes swollen and grows. This growth harms the bone around the joint. The lining also makes extra fluid that can cause swelling and make movement very painful.
PVNS isn't common. It can affect anyone, but it is most common in people 20 to 45 years old. It may happen slightly more often in men.
Doctors don't know exactly what causes PVNS. It doesn't seem to run in families. It doesn't seem to be caused by certain jobs or activities.
What are the symptoms of PVNS?
If you have PVNS, you'll notice swelling and stiffness in a joint, most often your knee. The joint may hurt. You may have a "popping" feeling when you move the joint. The symptoms usually start slowly and may come and go over time.
How is PVNS treated?
How will my doctor test for PVNSh?
PVNS can look like arthritis and some other joint conditions. Your doctor may use tests to check for these conditions. After a physical exam, your doctor may want X-rays of the affected joint.
Your doctor may also want to draw some fluid from the joint and test it. Another test, magnetic resonance imaging (MRI), takes a picture of the joint.
<----------------NOTE----------------->
In MRI, PDWI would show inhomogeneous materials in the synovial sac, but hemorrage might get similar appearance.
In order to distinguish these two, we might need to get images with contrast and fat sat (of course).
If the signal becomes bright, this must be the problem of synovial tissue.
If not, the chance of hemorrage is much more possible.
Your doctor may also want to draw some fluid from the joint and test it. Another test, magnetic resonance imaging (MRI), takes a picture of the joint.
<----------------NOTE----------------->
In MRI, PDWI would show inhomogeneous materials in the synovial sac, but hemorrage might get similar appearance.
In order to distinguish these two, we might need to get images with contrast and fat sat (of course).
If the signal becomes bright, this must be the problem of synovial tissue.
If not, the chance of hemorrage is much more possible.
How is PVNS treated?
The best way to treat PVNS is to remove the lining of the joint. This can be done with traditional surgery or with arthroscopy. In arthroscopy, the doctor makes a tiny cut in the skin over your joint. Then a thin tube is put into the joint to remove the lining.
Even with treatment, PVNS comes back about half the time. If the pain comes back again and again, radiation therapy may help. Sometimes, the joint must be replaced.
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Even with treatment, PVNS comes back about half the time. If the pain comes back again and again, radiation therapy may help. Sometimes, the joint must be replaced.
dyc collected on 20090219
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