very virulent or infectious.
Malignant refers to cancer cells that can invade and kill nearby tissue and spread to other parts of your body.
But not all tumors are malignant, or cancerous, and not all are aggressive. Benign tumors, while sometimes painful and potentially dangerous, do not pose the threat that malignant tumors do. "Malignant cells are more likely to metastasize [invade other organs]," says Fernando U
