During the last 10 years, sonography has become an essential examination in establishing the diagnosis of urological diseases. The use of high frequency real-time probes makes the visualization of superficial organs easy. Sonography is a valuable method for distinguishing an intrinsic testicular lesion from an extrinsic one. But, it is not always possible to perform a differential diagnosis between a vascular or an inflammatory process in an equivocal clinical situation. Color Doppler sonography is a system which combines conventional real-time sonography with real-time two-dimensional Doppler imaging. Thus, at the same time, it offers the possibility of viewing the lesion and checking the organ's vascularization. Our first clinical experience with this new device is presented.