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Fig. 2. —68-year-old man with abnormal findings on digital rectal examination and prostate-specific antigen of 10.5 ng/mL. Helical CT scan shows area of focal abnormal contrast enhancement in mid portion of left peripheral zone (arrow). Note lack of findings in right peripheral zone lesion. Transrectal sonographically guided biopsy (not shown) revealed prostatic adenocarcinoma (Gleason score of 6 in mid portion of left peripheral zone) and foci of adenocarcinoma (Gleason score of 5 in right peripheral zone).