As urology enters the 21st century, it is appropriate that the Atlas of an understanding of the appropriate patient populations for these Clinical Urology series captures and explains the major areas of procedures. This section also includes the management of benign modern urologic practice using a unique combination of images, and malignant adrenal disorders. Michael Marberger has assem­ schematics, tables, and algorithms. It does so in a compelling bled an extremely diverse and important set of noncancerous fashion, by combining a multilevel approach that includes the diseases of the kidney. Nephrolithiasis management is covered individual volumes and the internet. Urology is a specialty of great from medical therapy to endoscopy to incisional surgery. The breadth, and visual images provide much of the backbone of important role that laparoscopy has established in both excisional urologic diagnosis and endoscopy and are key to surgical tech­ and reconstructive renal surgery is visually depicted and nique. The increasingly complex diagnostic and treatment paths explained. The evolution of the techniques illustrated in this section will likely provide the basis for renal intervention in the are best depicted and understood as visual algorithms. The editors of this five-volume series have not only contributed 21st century. their world-renowned expertise to the chapters but have also Volume IV covers the diversity of pediatric urology under the assembled an outstanding group of individual chapter authors. editorship of Dix Poppas and Alan Retik.