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Normally, kidneys are about the size of a fist or 10 to 12 cm (about 5 inches). Kidney atrophy means that the kidney is smaller than normal. This can happen for two basic reasons. The first is that part of the kidney does not develop from birth (called a congenital problem) making a small kidney....

Kidneys perform crucial functions that affect all parts of the body and are involved in complex operations that keep the rest of the body in balance. When the kidneys are damaged by disease, other organs are affected. Kidney problems can range from a minor urinary tract infection to progressive...