The study of the peculiarities of the internal structure of urinary stones (uroliths) is topical in connection with the development of new methods of treatment of urolithiasis by their destruction or dissolution directly inside the human body. The new classification of uroliths developed by M.A. Ivanov in collaboration with the staff of the Medical Academy n.a. I.I. Mechnikov. I.I.Mechnikov A.H.Panin and O.V.Stetsik, demonstrates the morphological and structural-material signs determining the ability of aggregates to disintegrate under the influence of laser radiation. It is based on the notion that most of the uroliths belong to the nodule aggregates of monocentric type. Classification features are the basic types of structures of these formations: radial-beam, spherulitic and granular (cryptic), which, depending on the chemical composition, allow to attribute the studied object to a certain type, basic or intermediate. An attempt was made to classify a group of 32 urolites. As a result, it was found that the examined samples are really aggregates of the nodule type, but of the polycentric type. All studied objects fit into the classification framework, but correspond to the intermediate types, because none of the features exhaustively determines the structure of the sample, in particular, does not affect its zonal heterogeneity. This fact should be taken into account in the further improvement of the classification of renal stones.
