Imaging of the Urethra and Penis.

Retrograde urethrography is useful in trauma to identify urethral disruptions and in evaluation of urethral strictures. Penile fracture is defined by disruption of the tunica albuginea, can be evaluated with ultrasound or MR imaging, and requires surgical management. Urethral diverticula should communicate with the urethra, demonstrated with postvoid MR imaging. Penile-scrotal abscess may be related to retrograde genitourinary infection, foreign body, fistula, or a gas forming organism. Squamous cell carcinoma is the most common penile malignancy, and MR imaging can be useful in local urethral and penile tumor staging.