Manage Medullary Sponge Kidney: A Patient's Guide to Managing MSK - Paperbackby Winslow E. Dixon (Author) Medullary Sponge Kidney (MSK) also known as Cacchi Ricci Disease, is a congenital kidney disorder. Most medical professionals are taught that MSK is a "benign" condition, however, many MSK patients suffer with recurrent kidney stones, urinary tract infections, renal colic and flank pain which can result in chronic pain, frequent surgeries and the need for medical interventions such as renal stents. Manage Medullary Sponge