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Kaposi's sarcoma. Light micrograph of a malignant (cancerous) tumour (centre) in the liver of a patient with Kaposi's sarcoma. Kaposi's sarcoma is characterised by the abnormal growth of blood vessels. This patient also has AIDS (acquired immune deficiency syndrome), a disease caused by the human immunodeficiency virus (HIV) that weakens the immune system. Kaposi's sarcoma is a type of skin cancer that in AIDS patients often spreads to the lungs and liver and can be rapidly fatal.
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