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Brain lesions are areas of injury or disease in the brain. Lesions may be due to infection, tumors, exposure to certain chemicals, problems with the immune system, and demyelinating diseases such as Multiple Sclerosis. Sometimes the cause is not known.
From the above description of brain lesion types, it is evident that the different types are arranged, in general, according to different mechanisms that lead to brain cell changes which produce various brain lesions. The causes, however, can be further categorized. The following is a list of causes containing more specific subsets and descriptions: