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Perineural cysts, which are also known as Tarlov cysts, are fluid-filled sacs that form on nerves at the base of the spine. A person with such cysts would likely never know it. They almost never cause symptoms. When they do cause symptoms, however, the most common is pain in the lower back, buttocks, and legs.
Kidney Cysts, also called renal cysts, are round thin-walled sacs or pouches on the kidneys that usually contain liquid. They may vary widely in size, but most are often small. Some are present at birth (congenital), and others are caused by tubular obstructions. Typically, only one cyst occurs on the surface of a kidney, but multiple cysts can affect one or both kidneys. In most cases, the cysts are almost always benign (not cancerous) that rarely cause complications. Treatment is not normally required.