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Non-Hodgkin's lymphoma. Coloured computed tomography (CT, left) and positron emission tomography (PET, centre) scans of a patient with growths in the abdomen and chest due to non- Hodgkin's lymphoma (NHL). The two scans are combined at right. A radioactive tracer, injected into the patient's bloodstream, has been taken up by the tumours. Lymphoma is a malignant (cancerous) growth of white blood cells (lymphocytes). There are many types of lymphoma depending on the cells affected. White blood cells are part of the body's immune system. They travel around the body in a clear fluid called lymph. NHL can affect anyone, although it is more prevalent in men and those over 40. Its cause is not known. Treatment is with chemotherapy and radiotherapy.
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