A chance discovery revealed the kidneys have a secret water-saving pathway—opening the door to better treatments for polycystic kidney disease. Credit: Shutterstock Researchers at Mayo Clinic have discovered a previously unknown way the kidneys help maintain the body's water balance, a finding that could eventually lead to better treatments for polycystic kidney disease (PKD) and other conditions. The study, led by Mayo Clinic nephrologist Fouad Chebib, M.D., was published in the Journal of