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Lymphoma swelling on the neck of a 58-year-old man. The swelling is due to a cutaneous small-cell form of B-cell lymphoma. Lymphomas are blood cancers that affect the lymph nodes, part of the lymphatic systems. In this case, the lymphoma arose from the B-cells (B lymphocytes), a type of white blood cell. Prognosis and treatment depends on the type of lymphoma and how far the disease has progressed.
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