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Search form. Causes. The cause or causes of lymphoma are largely a mystery. There may be some genetic predisposition, or it may be caused by an environmental trigger such as pollution. There is not, however, sufficient evidence to provide a definitive answer.
Lymphomas are tumors made up of lymph cells (lymph is a fluid that flows through all the tissues of the human body and plays an important role in cleaning out bacteria and other foreign matter). Metastic tumors are brain tumors that have originated elsewhere in body and have metastasized to the brain.