KEMENY, ISM / SCIENCE PHOTO LIBRARY KEMENY, ISM / SCIENCE PHOTO LIBRARY
Lymph node cancer. Light micrograph of a section through a lymph node of a patient with diffuse B-cell non-Hodgkin lymphoma. Lymph nodes filter harmful organisms from tissue fluid. Non-Hodgkin lymphoma (NHL) is a cancer of the B-cells (B-lymphocytes), a type of white blood cell in the body's immune system. In this case, the large B-cells (circles with dark patches) are widely spread through the lymphoid tissue. This form is a high grade lymphoma and, unlike low grade lymphomas, it is a fast-spreading cancer that produces severe symptoms. It causes lymph node enlargement, headaches and skin ulceration. Treatment is by radiotherapy, anti-cancer drugs and, if necessary, bone marrow transplant. Magnification: x280 when printed 10 centimetres wide.
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