Grant D Schmit1, R Houston Thompson2, Navtej S Buttar3. 1. Department of Radiology, Mayo Clinic School of Medicine, 200 1st St. SW, Rochester, MN 55905. Electronic address: schmit.grant@mayo.edu. 2. Department of Urology, Mayo Clinic School of Medicine, 200 1st St. SW, Rochester, MN 55905. 3. Department ofGastroenterology, Mayo Clinic School of Medicine, 200 1st St. SW, Rochester, MN 55905.