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B-cell chronic lymphocytic leukemia (B-CLL), also known as chronic lymphoid leukemia (CLL), is the most common type of leukemia (a type of cancer of the white blood cells) in adults.  CLL affects B cell lymphocytes, which originate in the bone marrow, develop in the lymph nodes, and normally fight infection by producing antibodies.
Normal thyroid gland does not contain lymphatic tissue; its presence is characteristic for pathological conditions, mainly as a result of the transformation of autoimmune thyroiditis. Hashimoto’s thyroiditis most often coexists with MALT (mucosa-associated lymphoid tissue), which represents approximately 23% of thyroid lymphomas . The most frequent histologic type of thyroid lymphomas is diffuse large B-cell lymphoma (DLCL), which accounts for about 50% of all cases. Small lymphocytic B-cell lymphoma (SLL-B) is an extremely rare type of thyroid lymphoma (about 4% of cases). According to the classification presented by World Health Organization in 2008, B-cell chronic lymphocytic leukemia.