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.
Noun. 1. angioma-a tumor consisting of a mass of blood or lymphatic vessels. angiopathy-any disease of the blood vessels or lymph ducts. neoplasm, tumor, tumour-an abnormal new mass of tissue that serves no purpose. haemangioma, hemangioma-benign angioma consisting of a mass of blood vessels; some appear as birthmarks.