Congenital: There are usually benign fluid filled sacs that are located in the kidney as a "cyst". Kidney/renal cysts are pretty common. They are congenital, which means they may be inherited or just a result of the process of growth alterations as a fetus from uncertain intrauterine factors. Sometimes they can obstruct the kidney. If you have it on a scan, see a urologist.
Answered 4/1/2015
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