[Incidence and treatment of urinary calculi in patients in Frederiksborg County].

The case records of all patients admitted to one of the hospitals in the County of Frederiksborg with radiologically demonstrated first episodes of urinary calculi during a period of one year in 1983/1984 and 1988/1989 respectively were reviewed retrospectively. Uniform frequencies of calculus incidence and sex distribution were encountered mutually and as compared with the remainder of Denmark during the two periods. In 30% of the cases the calculi were localized to the kidneys and in 58% to the ureter. In approximately 65% of the patients, the greatest diameter of the stones was 100 mm or less. Spontaneous passage of the stones occurred in approximately 40%. Development in the treatment of urinary tract stones has followed the development in the county as a whole. The number of operative interventions during the five year period was reduced by 30% and extracorporeal shock wave treatment was employed in 22% during the second period.