The term 'malignant lymphoma' describes virulent tumors of the lymphatic system, which are caused when abnormal and redundant lymphocytes multiply uncontrollably. (Lymphocytes are a form of white blood cell and include B cells, T cells, and natural killer cells.)
Although there are a variety of subtypes, lymphoma is often divided into two categories: Hodgkin and non-Hodgkin lymphoma, with low-malignancy and high-malignancy symptoms. Non-Hodgkin lymphomas include multiple myeloma, which is the second most common malignant disease in Western countries.
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