Photograph of the right arm and chest of a man suffering from AIDS (Acquired Immune Deficiency Syndrome), showing the dark skin lesions characteristic of Kaposi's sarcoma, a type of vascular cancer. Kaposi's sarcoma was hitherto usually only seen in elderly persons of Jewish or Mediterranean stock, but is one of the two most common opportunistic diseases associated with AIDS. Its spread, however, is an uncommon cause of death; AIDS patients are more likely to succumb to Pneumocystis carinii pneumonia, the other rampant opportunistic infection associated with AIDS.