Diffusion-Weighted MRI in Staging Patients With Localized Prostate Cancer

Inclusion Criteria: * Biopsy-documented adenocarcinoma of the prostate which is intermediate or high risk, defined as possessing one or more of the following features: * Gleason \>= 7 * \> 50% biopsy cores + * Prostate-specific antigen (PSA) \>= 10 * Interested in undergoing a radical prostatectomy as definitive management for prostate cancer * No clinical or radiographic evidence for distant metastatic disease * In subjects with PSA \< 20 no radiographic staging is required in the absence of clinical symptoms for distant metastatic disease; for those with PSA \> 20, a bone scan must document lack of concern for bone involvement Exclusion Criteria: * Ineligible for surgery due to cardiac, pulmonary, or other major comorbidity factor * History of claustrophobia * Pacemaker or other implanted metal objects which would make subject ineligible for MRI, per standard criteria * Unable to give written informed consent