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Hodgkin's lymphoma. Computed tomography (CT, left) and positron emission tomography (PET, centre) scans of a patient with growths in the abdomen due to Hodgkin's lymphoma. At right the scans have been combined and coloured. A radioactive tracer, injected into the patient's bloodstream, has been taken up by the tumours. Hodgkin's lymphoma is a malignant (cancerous) growth of white blood cells (lymphocytes). It is characterised by the presence of Reed- Sternberg cells, a type of lymphocyte. Hodgkin's lymphoma is most common in young adults and those over 50. The most common symptom is swollen, non- painful lymph nodes in the upper body. Treatment is with chemotherapy and radiotherapy.
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