[Incidence of upper urothelial tumor in the Autonomous Community of La Rioja in 1976-1991].

Study of the incidence rate of upper urothelium tumours between 1976 and 1991 among the population of the autonomous community La Rioja. A study by age, sex and time intervals, totalling 32 cases, is conducted. A greater incidence in males, and between 1987-1991 in terms of time, is observed. With regard to location of the upper urothelium tumour, a significant difference is found between right and left ureters and right and left renal pelvis. In 14 cases, an associated vesical carcinoma was noted (RR = 5338.9 with 95% CI from 2668.5 to 10681.4).