Limited number of CE PIH US studies of renal lesions up to now is usually just about the improvement of conspicuity of lesions. In this study we would like to go one step ahead and find answers to : is it possible to see detailed vascularization with CE PIH US and is it possible to characterize these lesions?The preliminary results of our study showed that CE PIH US is superior to power Doppler in depicting vascularity. However both techniques were not satisfactory in lesion characterization. We suppose that this might be overcome by quantifying CE PIH in the future studies.