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Illustration of the normal anatomy and three segments of prostatic urethra as defined and used in this study. The prostatic urethra is defined as the urethra in the prostate, i.e., from the bladder to the prostate/pelvic floor border, as shown on computed tomography. The superior segment is defined one-third of all prostatic urethra to the bladder side, and the inferior segment is the portion to the pelvic floor side. Each segment is divided evenly
