Figure 4a. Biopsy-proved adenocarcinoma in a 61-year-old man. (a) Wash-in MR image obtained with a fast field echo sequence (17/2.9; flip angle, 20°) shows a higher wash-in rate in the right peripheral zone (arrow) than in other areas. (b) Washout MR image obtained with the same sequence as a shows a higher washout rate in the right peripheral zone (arrow) than in other areas.