1. From the Department of Radiology and Biomedical Imaging (R.M.H., A.C.W., T.A.H.), Department of Anatomic Pathology (J.P.S.), Department of Urology (J.P.S., A.C.W., H.G.N., K.L.G., P.R.C.), and UCSF Helen Diller Family Comprehensive Cancer Center (A.C.W., L.Z., P.R.C., T.A.H.), University of California, San Francisco, 505 Parnassus Ave, M-391, San Francisco, CA 94143-0628.