[Possibility for studying the life expectancy of patients with Balkan endemic nephropathy by dispensary observation].

The follow-up cards of 1100 patients that died of Balkan endemic nephropathy (BEN) within the period 1962-1981 were studied with a view to establishing the incidence of the disease in Vratza district, affection of sex and age and chiefly--the duration of the disease. The authors established that the disease was found in 47 settlements of Vratza district, that the females were more often affected as compared with the males and that the subjects aged from 30 to 70 were most frequently affected. More that the half of the patients with BEN was established by the authors, to die with--in the first 5 years since the onset of the disease, whereas the rest--live longer, in single cases, over 20 years.

Geographic correlation between the occurrence of endemic nephropathy and urinary tract tumours in vratza district, Bulgaria.

Data on the occurrence of endemic nephropathy (EN) and urinary tract and other cancers in an endemic region of Vratza district, Bulgaria, for the years 1965-1974, are presented. In endemic villages a high incidence of urinary tract tumours, affecting in particular the renal pelvis and ureter, closely correlated with the EN incidence and mortality rates. In the villages with high and moderate EN incidences urinary tract tumours are the most common neoplasms.

[Study of the distribution of kidney calculi in Vrastsa District].

The authors have studied the RCD spread in Vratza district according to the material of the therapeutic departments in the district for the period 1969--1973 and according to the material of the out-patient department -- polyclinical--1971--1973. During that period 16,294 patients with diseases of the urinary system were registered, 6311 out of them with RCD, i. e.