DR M.A. ANSARY / SCIENCE PHOTO LIBRARY DR M.A. ANSARY / SCIENCE PHOTO LIBRARY
Kaposi's sarcoma. Light micrograph of a section through the tunica adventitia (outer layer) of the aorta, one of the major blood vessels of the heart, showing tumours caused by Kaposi's sarcoma. This patient had AIDS (acquired immune deficiency syndrome), a disease that is caused by the human immunodeficiency virus (HIV). It causes a gradual weakening of the immune system, making otherwise harmless infections life-threatening. Kaposi's sarcoma is a type of skin cancer. In AIDS it often spreads to other tissues and can be rapidly fatal.
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