In this issue of Urologic Clinics of North America, guest editors Drs. Onofrio Antonio Catalano and Michael Stanley Gee bring their considerable expertise to the topic of Urologic Tract Imaging. Technical advances in MRI, CT, and ultrasound, along with molecule-targeted radiopharmaceuticals and urinary contrast-based MRI and US, have transformed urologic tract imaging in recent years. In this issue, top experts review the principles of various novel imaging technologies, describe their application to the urinary tract, and provide imaging examples of normal anatomy and pathology.