Potassium metal was first isolated in 1807 in England by Sir Humphry Davy, who derived it from caustic potash (KOH, potassium hydroxide) by the use of electrolysis of the molten KOH with the newly discovered voltaic pile.
Angiomyolipomas are the most common benign tumour of the kidney. Although regarded as benign, angiomyolipomas may grow such that kidney function is impaired or the blood vessels may dilate and burst leading to bleeding.
hemangioma. 1. a benign tumor, usually in infants or children, made up of newly formed blood vessels and resulting from malformation of angioblastic tissue of fetal life. 2. a benign or malignant vascular tumor resembling the classic type but occurring at any age.n the majority of cases it appears as a network of small blood-filled capillaries near the surface of the skin, forming a reddish or purplish birthmark. cavernous hemangioma a congenital vascular malformation that has a soft, spongy consistency and may contain a large amount of blood.