A malignant tumor that arises from the cells lining blood vessels or lymphatic vessels, growing within soft tissue.
From Greek 'angion' (vessel) + 'sarcoma' (flesh tumor). This cancer term specifically identifies tumors originating from endothelial tissue rather than other cell types.
Angiosarcomas are rare but terrifying cancers that start in the cells lining blood vessels—they're especially dangerous because they grow inside the vascular system itself, making them hard to detect and treat.
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