The utilization of MRI for the diagnosis of prostate cancer in men at risk is relatively new. In this interview, filmed at the 2018 Genitourinary Cancers Symposium, in San Francisco, CA, Mark Emberton, MD, FRCS, of University College London, London, UK, explains why the use of MRI is important for the diagnosis and treatment of prostate cancer. Prof. Emberton also explains the problems that can arise from not determining tumor location and volume at diagnosis.