A Human Polycystic Kidney (image) University of California - Santa Barbara Share Print E-Mail Caption A human polycystic kidney can grow to the size of a regulation size football. A normal kidney is the size of a fist. Credit Courtesy of the Indiana University School of Medicine - See more at: http://www.news.ucsb.edu/2015/015527/delivering-drugs-right-place#sthash.Lfe8IEKm.dpuf Usage Restrictions None Share Print E-Mail Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.