Monomelic amyotrophy (MMA) is a condition of the nerves called motor neurons that are responsible for controlling voluntary muscles. The condition causes no pain. MMA occurs in males aged between ages 15 and 25. The onset and progression of the disease are slow. The condition can be mostly found in Asia, particularly in countries like Japan and India.
There is no cure for MMA. However, the treatment consists of muscle strengthening exercises and training in hand coordination.
The symptoms of MMA usually grow slowly for one or two years and then become stable. The disability remains slight. In rare cases, the weakness progresses to the opposite limb.
In most cases, the cause is unknown, although there have been a few published reports linking MMA to traumatic or radiation injury. There are also familial forms of MMA.
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Read more on Monomelic Amyotrophy Causes and Risks.
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