@alex94- Treatment options depend greatly on what type of brain lesion it is. The main goals during treatment are to relieve symptoms, provide a cure, or to improve the quality or duration of life.
In some cases, the lesions are found accidentally and the patient is not presenting with any significant symptoms. Those types are often left alone and closely monitored. If it starts causing problems or symptoms start to develop, other options are then looked at.
There is also the option of surgically removing the lesion, if possible. With new technology, we are now able to get to the “hard to reach” areas of the brain.
Medications are often given to prevent or fight infections and to calm the immune system down.