About the Author: Dr. Vikram S. Dogra is currently Professor of Radiology and Urology at the University of Rochester New York. He is fellow of the European Society of Urogenital Radiology and fellow of the Society of Uroradiology. He has taught and trained hundreds of radiology residents and trained many fellows in radiology from Egypt, India, China, Sri Lanka, Mexico, Turkey and Israel. Dr. Dogra has 7 books of Radiology to his credit. Dr. Dogra is also current chair of the continuous professional improvement - Genito Urinary module subcommittee of the American College of Radiology. Dr. Gregory T. MacLennan earned his M.D. degree from the University of Manitoba, Canada, in 1971. He spent six years training in General Surgery and Urology at Manitoba Affiliated Teaching Hospitals, and followed this with a fellowship in Urodynamics at St. Peter's Hospitals, London, England. From 1978 until 1989, Dr. MacLennan practiced Urology in Grand Forks, N.D. and progressed from Clinical Instructor to Associate Professor of Surgery at the University of North Dakota School of Medicine. In 1989, he returned to Manitoba Affiliated Teaching Hospitals and spent 5 years in Residency and fellowship training in Anatomic Pathology and Cytopathology. In 1994 he began a Fellowship in Surgical and Genitourinary Pathology at Mayo Clinic, Rochester, MN. Following his Fellowship, he joined the staff of the Department of Pathology at Case Western Reserve University in Cleveland, Ohio, in 1995. Dr. MacLennan is Board certified in both Urology and Anatomic Pathology in both Canada and the United States. Additionally, he is Board certified in Cytopathology. Dr. MacLennan is Professor of Pathology at Case Western Reserve School of Medicine, with secondary appointments in Urology and Oncology. He is the Division Chief of Anatomic Pathology, the Director of the Human Tissue Procurement Facility at University Hospitals of Cleveland, and Director of the Tissue Procurement and Histology Core Facility of the Seidman Cancer Center. Dr. MacLennan has a particular interest in genitourinary pathology. Much of his time is committed to diagnostic surgical pathology and cytopathology. His research has been predominantly clinically oriented, in collaboration with urologists, oncologists and other pathologists, but has also involved collaborations with basic scientists.