Medullary Sponge Kidney: Introduction
Section Editor: Dharam M. Ramnani, MD
Virginia Urology, Richmond, VA, USA
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Introduction: Medullary sponge kidney is a benign developmental malformation in which there is ectasia of the distal portion of the collecting ducts with cyst formation in the medullary pyramids. It is frequently associated with nephrocalcinosis and nephrolithiasis.