Figure 6b. Biopsy-proved adenocarcinoma in a 61-year-old man. (a, b) T2-weighted axial MR images obtained at the level of the base of the prostate (a) and at the seminal vesicles (b) show a low-signal-intensity tumor (T) in the base of the right lobe with extracapsular extension (arrow in a) and invasion into the seminal vesicles bilaterally (arrows in b). (c) T2-weighted coronal image shows asymmetry of the right and left lateral aspects of the base, with an angulated contour of the right base (arrow), a finding that is highly suggestive of extracapsular extension of the tumor (T). (d) On the T2-weighted sagittal MR image, the fat plane between the seminal vesicle and the posterior urinary bladder is obliterated (arrow). The angle made by the posterior bladder wall and the anterior border of the seminal vesicles is more convex than that seen in healthy men (cf Fig 1i).