Penile imaging.

In Peyronie disease, magnetic resonance (MR) imaging is better than ultrasound in detecting impalpable plaques and plaque dimensions, whereas calcified plaques are better visualized on ultrasound. Ultrasound with color Doppler technique is superior to MR imaging in evaluating vascular causes of erectile dysfunction. In penile fractures, MR imaging should be performed with the patient in the erect position to avoid kinking between the pendulous and fixed parts and thus enable better demonstration of the site of tunica albuginea disruption for surgical planning. MR imaging is better than ultrasound in delineating primary penile malignancies and demonstrating lymph nodal involvement.