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.
Definition of Angiomyolipoma of the Kidney. Angiomyolipoma of the kidney is a rare benign renal tumor with a high fat content. Epidemiology of Renal Angiomyolipoma. Prevalence: The prevalence in autopsies is 0.3%, with ultrasound screening 0.1%. Women are much more frequently affected than men.
In a mass with typical ultrasonographic features, fatty attenuation on plain abdominal radiographs, planar tomograms, and CT scans is virtually diagnostic of angiomyolipomas. However, an angiomyolipoma is not the only renal tumor that may contain fat. Rarely, but most importantly, fat may be found in a renal cell carcinoma because of the invasion of perinephric fat or metaplasia in the tumor.