Urolithiasis is one of the leading places in the field of uropathology. The relevance of this topic is determined by the fact that every year the number of patients with urolithiasis is steadily increasing, both in the Russian Federation and in developed countries. According to most authors, that due to the increasing life expectancy, changes at the chemical composition of water, lifestyle and peculiarities of human nutrition, as well as global climate changes. Medico-economic and social significance of urolithiasis is that roughly 2 / 3 of patients who get sick are 30 to 60 years old. The disease is characterized by frequent relapses, high prevalence of complicated forms, in some cases leading to disability of the patient, which makes it difficult to treat. In spite of this, mortality from urolithiasis in the last few years has noticeably decreased, due to the active study of the etiopathogenesis of the disease, improvement of diagnostic methods, development and implementation of minimally invasive technologies in the treatment of urolithiasis. This literature review provides information on the prevalence of urolithiasis, the etiology and pathogenesis of stone formation in the urinary system, as well as main information of the most effective methods of diagnosis and treatment of urolithiasis at this time.

Improving the effectiveness of treatment of urolithiasis is a topical issue in modern urology. Despite a large number of studies on this problem, there is currently no unified algorithm for assessing postoperative complications of removal of calculi of the renal cavity system by transurethral access. Purpose of the study: based on a retrospective analysis to adapt the classification of postoperative complications according to Clavien Dind from 2004 to describe the complications of transurethral contact pyelocalicolithotripsy. Materials and methods. A retrospective analysis of the results of surgical treatment of 211 patients with kidney stones with a density of 960 HU to 1840 HU was performed. Ultrasonic energy was used for lithotripsy. Criteria for the normal course of the postoperative period in patients have been formulated. Results. The number of postoperative complications was calculated. The obtained data are distributed according to the corresponding gradations of the adapted Clavien Dindо classification. Conclusion. The improved Clavien Dindo classification, taking into account the adaptation, can be used as an up-to-date, accessible and logical template for assessing the postoperative complications of transurethral contact pyelocalicolithotripsy.

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