Axial transrectal ultrasonographic (TRUS) scan shows extensive hypoechoic area (arrows) in the right peripheral zone. Biopsy revealed prostatic adenocarcinoma.

Axial transrectal ultrasonographic (TRUS) scan shows a hypoechoic area in left peripheral zone and a small hypoechoic area in right peripheral zone (arrows). Biopsy revealed an adenocarcinoma (Gleason grade 6).

Prostate carcinoma. Axial transrectal sonogram in a patient with normal results during digital rectal examination and a prostate-specific antigen (PSA) level of 9 ng/mL. Image shows extensive bilateral but predominantly left-sided hypoechoic areas in the peripheral zone (arrows). Biopsy confirmed prostatic carcinoma of Gleason grade 8. Minor capsular irregularity is present on the left; this is consistent with a T3 tumor.

Sonogram shows an extensive, hypoechoic T3 tumor (arrowheads). Capsular irregularity is present, particularly on the right and posteriorly, with a suggestion of infiltration into the rectal wall (arrow).