From March 1995 to February 1996, sixteen consecutive patients with Peyronie's Disease (PD) were routinely submitted to penile dynamic colour-coded doppler ultrasonography (CCDU). The test yielded normal results in 6 patients who had no erectile problems and in other 4 patients who conversely complained of reduced erectile function. In the other 6 patients who complained of reduced erectile function, the test pointed out pure arteriogenic failure in 1 case, pure venogenic failure in 4, and mixed arteriogenic and venogenic failure in 1. CCDU enables a precise assessment of erectile function as well of the site, kind and entity of the penile curvature to be corrected. These data are very useful when planning the surgical approach for each patient.