What is (are) Medullary Sponge Kidney ?
Medullary sponge kidney, also known as Cacchi-Ricci disease, is a birth defect where changes occur in the tubules, or tiny tubes, inside a fetus kidneys.
                
In a normal kidney, urine flows through these tubules as the kidney is being formed during a fetus growth. In medullary sponge kidney, tiny, fluid-filled sacs called cysts form in the tubules within the medullathe inner part of the kidneycreating a spongelike appearance. The cysts keep urine from flowing freely through the tubules.
                
Symptoms of medullary sponge kidney do not usually appear until the teenage years or the 20s. Medullary sponge kidney can affect one or both kidneys.