Echography is highly important today for the identification and differentiation of renal diseases. It also enable target biopsy of identified lesions to be carried out, thus making for precise histological diagnosis. Indications and results of echography in the diagnosis of 97 cases of suspect masses of renal origin consisting of cysts, hydropyonephrosis, tumours, multicystic and polycystic kidneys are considered. Overall diagnostic accuracy was 92.7%. The features pointing to differential diagnosis of individual lesions and the method of examination, based on the use A and B Scan with grey scale are described. It is concluded that, with their high diagnostic accuracy and non-invasivity, scanning techniques represent an indespensable tool for the diagnosis of renal masses.