what are simple kidney cysts
A cyst is a closed pouch or sac filled with air or liquid. Simple kidney cysts are usually small round sacs that have a thin wall and are filled with a watery fluid. As people get older, cysts can form on the surface or in the nephrons of the kidneys. They can range in size from a small pea to as large as a grapefruit.imple Kidney Cysts. Kidneys are bean-shaped organs located in the lower back. The kidneys help to control the amount of salt and water in the body, and also remove waste products by filtering the blood and making urine.