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.
1. myoma-a benign tumor composed of muscle tissue. benign tumor, benign tumour, nonmalignant neoplasm, nonmalignant tumor, nonmalignant tumour-a tumor that is not cancerous.leiomyoma-benign tumor of smooth muscle (usually in the uterus or digestive tract).rhabdomyoma-benign rumor of striated muscle.. myoma-a benign tumor composed of muscle tissue. benign tumor, benign tumour, nonmalignant neoplasm, nonmalignant tumor, nonmalignant tumour-a tumor that is not cancerous.