a multifocal malignant neoplasm of primitive vasoformative tissue, occurring in the skin and sometimes in the lymph nodes or viscera, consisting of spindle cells and irregular small vascular spaces frequently infiltrated by hemosiderin-pigmented macrophages and extravasated red blood cells. Clinically manifested by cutaneous lesions consisting of reddish-purple to dark-blue macules, plaques, or nodules; seen most commonly in men older than 60 years of age and in AIDS patients, as an opportunistic disease associated with human herpes virus-8 infection.
Synonym(s): multiple idiopathic hemorrhagic sarcoma
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