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.
Angiomyolipomas are typically found in the kidney but have also been commonly found in the liver and less commonly the ovary, fallopian tube, spermatic cord, palate and colon. The Maclean imaging classification system for renal angiomyolipomas is based on the location of the angiomyolipoma within the kidney.