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COVID-19 is a new unexplored disease about which nothing has been known so far. And therefore, the consequences of COVID-19 came as a complete surprise to doctors. Their forces were directed to the treatment of the acute stage of the disease, and they did not even suspect that in many patients the health problems would not end along with the end of the acute phase, which proceeds with fever and other vivid symptoms of viral inflammation. Information that COVID-19 does not end with a decrease in temperature and the disappearance of characteristic symptoms first appeared on social networks. And I must say that the medical community did not immediately take seriously the complaints of those who seemed to have recovered, but continued to complain of weakness, shortness of breath, memory impairment, etc. Only a few months later, when there were so many complaining that it was no longer possible to ignore doctors acknowledged the existence of a problem. In order to get an objective picture of how patients who have had COVID-19 actually feel, a number of studies have been conducted. For example, in the state of Michigan (USA), 1250 patients who were discharged from the hospital where they were treated for a new coronavirus infection were called. The survey showed that 6.7% of patients died during the study period, 32.6% of patients reported persistent symptoms, including 18.9% new or worsening symptoms. The most commonly reported were shortness of breath when climbing stairs (22.9%), less commonly cough (15.4%) and permanent loss of taste and/or smell (13.1%). Similar data were obtained in studies conducted in Europe.

Background: Understanding the anatomical structure of the human kidney, particularly its zonal and segmental organization, is crucial for both theoretical knowledge and practical applications in surgical procedures. That is why the purpose of the article was to study the variants of the zonal and segmental structure of human kidneys. Methods: 116 corrosive preparations of the arterial system of the human kidney served as the material for the study. The authors identified their extra-organ branches: a) the number of arterial vessels in the kidney hilum; b) the topographic and anatomical features of the renal artery trunks. In a 3D projection, zones of local zonal blood supply to areas of the renal parenchyma were identified, depending on the di- and trichotomic variants of the division of the main renal artery, A. renalis (I). Results: It was found that some lines of the passage of the zones of natural divisibility of the kidneys with different variants of the division of A. renalis (I). There were from 5 to 7 (6 ± 1) segments in the kidneys on average. It is possible that if a four-zone blood supply system with corresponding zones of natural kidney divisibility is found in the kidneys, where the zones mostly don’t coincide with the boundaries of the passage of segments in their classical version, the number of segments will be even greater. Conclusion: The results of the conducted study show that considering the generally accepted zones and boundaries of the passage of segments with zones of natural divisibility, which were not previously considered, the kidneys have an individual segmental structure, which requires revision. The authors believe that the generally accepted classical five-segment kidney model is outdated. [ABSTRACT FROM AUTHOR]